NAPLEX (North American Pharmacist Licensure) Exam — Questions and Answers

Question 1: A laminar airflow workbench (LAFW) directs HEPA-filtered air in which primary direction during sterile compounding?

Downward over the work surface
Horizontally toward the compounder (Correct answer)
Toward the back of the hood
In a turbulent mixing pattern

Correct answer: Horizontally toward the compounder

A horizontal LAFW pushes HEPA-filtered air horizontally from the back toward the operator across the work surface.

Question 2: A patient with heart failure with reduced ejection fraction (HFrEF) is on lisinopril and metoprolol succinate. Which addition best aligns with guideline-directed medical therapy?

Diltiazem
Flecainide
A mineralocorticoid receptor antagonist such as spironolactone (Correct answer)
Verapamil

Correct answer: A mineralocorticoid receptor antagonist such as spironolactone

Adding an MRA improves survival in HFrEF and is a core pillar of guideline-directed therapy.

Question 3: Coadministration of clopidogrel and omeprazole raises concern primarily because:

Omeprazole independently inhibits platelet aggregation
The combination causes dose-dependent nephrotoxicity
Omeprazole inhibits CYP2C19, reducing conversion of clopidogrel to its active metabolite (Correct answer)
Omeprazole increases clopidogrel GI absorption significantly

Correct answer: Omeprazole inhibits CYP2C19, reducing conversion of clopidogrel to its active metabolite

Clopidogrel is a prodrug requiring CYP2C19-mediated bioactivation to its active thiol metabolite; omeprazole's inhibition of CYP2C19 reduces active metabolite formation, potentially diminishing antiplatelet efficacy.

Question 4: The mechanism of action of SGLT2 inhibitors (e.g., empagliflozin) is:

Decreasing hepatic gluconeogenesis
Stimulating insulin secretion
Blocking renal proximal tubule glucose reabsorption (Correct answer)
Slowing gastric emptying

Correct answer: Blocking renal proximal tubule glucose reabsorption

SGLT2 inhibitors block glucose reabsorption in the proximal tubule, increasing urinary glucose excretion.

Question 5: Which counseling is correct for a patient prescribed oral tetracycline?

Take only at night with calcium
Take with milk for absorption
Avoid antacids and dairy within 2 hours (Correct answer)
Crush with iron supplement

Correct answer: Avoid antacids and dairy within 2 hours

Polyvalent cations in dairy, antacids, and iron chelate tetracyclines and reduce absorption.

Question 6: A patient newly started on a statin reports muscle aches. What is the appropriate counseling response?

Ignore it as statins never cause muscle problems
Report muscle pain, tenderness, or dark urine to the provider (Correct answer)
Double the statin dose immediately
Stop drinking all fluids

Correct answer: Report muscle pain, tenderness, or dark urine to the provider

Muscle pain with dark urine may signal myopathy or rhabdomyolysis and should be reported.

Question 7: Which antipsychotic medication requires mandatory enrollment in a Risk Evaluation and Mitigation Strategy (REMS) program due to the risk of severe agranulocytosis?

Aripiprazole
Clozapine (Correct answer)
Olanzapine
Quetiapine

Correct answer: Clozapine

Clozapine carries a black box warning for potentially fatal agranulocytosis and requires the Clozapine REMS Program, which mandates ANC monitoring before dispensing. No other antipsychotic has this requirement.

Question 8: A patient who was recently started on lisinopril for hypertension develops a persistent, non-productive cough. This adverse effect is primarily attributed to the accumulation of which substance in the respiratory tract?

Bradykinin (Correct answer)
Angiotensin II
Histamine
Aldosterone

Correct answer: Bradykinin

Angiotensin-converting enzyme (ACE) is responsible for both converting angiotensin I to angiotensin II and for breaking down bradykinin. By inhibiting ACE, lisinopril causes an accumulation of bradykinin. Elevated levels of bradykinin in the lungs can irritate cough receptors and stimulate the cough reflex, leading to the characteristic dry, non-productive cough associated with this drug class.

Question 9: The anxiolytic and sedative effects of diazepam are produced by which of the following molecular actions on the GABA-A receptor?

Directly activating the GABA-A receptor in the absence of GABA.
Potentiating the effects of GABA by increasing the frequency of chloride channel opening. (Correct answer)
Increasing the duration of chloride channel opening when GABA is bound.
Blocking the reuptake of GABA from the synaptic cleft.

Correct answer: Potentiating the effects of GABA by increasing the frequency of chloride channel opening.

Benzodiazepines like diazepam are positive allosteric modulators of the GABA-A receptor. They bind to a site distinct from the GABA binding site, which increases the receptor's affinity for GABA. This potentiation results in an increased frequency of chloride ion channel opening when GABA is bound, leading to enhanced neuronal inhibition and producing anxiolytic and sedative effects.

Question 10: A patient is brought to the emergency department with respiratory depression following a suspected heroin overdose. The administration of naloxone rapidly improves the patient's breathing. What is the mechanism of action of naloxone?

It is a competitive antagonist at opioid receptors (Correct answer)
It acts as a partial agonist at the mu-opioid receptor
It stimulates the respiratory center in the medulla
It metabolizes opioids into inactive compounds

Correct answer: It is a competitive antagonist at opioid receptors

Naloxone is a competitive opioid receptor antagonist. It has a high affinity for opioid receptors, particularly the mu-receptor, and displaces opioids that are already bound, thereby reversing their effects, including respiratory depression.

Question 11: A 65-year-old with no prior pneumococcal vaccination should receive which option?

PPSV23 alone always
No pneumococcal vaccine
Two doses of PCV13 only
PCV20 alone, or PCV15 followed by PPSV23 (Correct answer)

Correct answer: PCV20 alone, or PCV15 followed by PPSV23

Current recommendations allow either PCV20 alone or PCV15 followed by PPSV23 for pneumococcal-naive older adults.

Question 12: Why does hypokalemia potentiate digoxin toxicity?

Hypokalemia decreases digoxin plasma protein binding
Hypokalemia increases digoxin renal clearance
Potassium and digoxin compete for the same binding site on Na+/K+-ATPase (Correct answer)
Low potassium independently suppresses cardiac conduction

Correct answer: Potassium and digoxin compete for the same binding site on Na+/K+-ATPase

Potassium competes with digoxin for binding to the cardiac Na+/K+-ATPase; when serum potassium is low, digoxin binds more avidly to the pump, amplifying both therapeutic and toxic effects at normal drug concentrations.

Question 13: Spironolactone exerts its diuretic and potassium-sparing effect by:

Inhibiting carbonic anhydrase
Antagonizing aldosterone receptors in the distal nephron (Correct answer)
Inhibiting the Na-K-2Cl transporter
Blocking the Na-Cl cotransporter

Correct answer: Antagonizing aldosterone receptors in the distal nephron

Spironolactone blocks mineralocorticoid (aldosterone) receptors, sparing potassium.

Question 14: Which of the following types of data are ordinal?

Improvement Yes/No
NYHA I-IV
Sex
Grade of breast cancer (Correct answer)

Correct answer: Grade of breast cancer

Ordinal data is a type of categorical data where the categories have a natural, meaningful order or ranking, but the differences between categories are not necessarily equal. The grade of breast cancer (e.g., Grade 1, 2, 3) exemplifies ordinal data because it represents increasing severity or aggressiveness in a ranked sequence. Other options like sex or improvement (yes/no) are nominal, lacking an inherent order.

Question 15: A patient on chronic opioid therapy for cancer pain reports constant constipation. What is the most appropriate addition to the plan?

A bulk-forming fiber laxative alone
Loperamide
No intervention as tolerance develops
A scheduled stimulant laxative with a stool softener (Correct answer)

Correct answer: A scheduled stimulant laxative with a stool softener

Opioid-induced constipation does not improve with tolerance and is best managed with a scheduled stimulant laxative plus a softener.

Question 16: Which mechanism explains why ACE inhibitors can cause a dry cough?

Accumulation of bradykinin and substance P (Correct answer)
Histamine release from mast cells
Direct beta-2 receptor blockade
Increased angiotensin II levels

Correct answer: Accumulation of bradykinin and substance P

ACE normally degrades bradykinin, so its inhibition raises bradykinin levels, triggering cough.

Question 17: Geometric dilution is a technique used primarily to achieve what during non-sterile compounding?

Reduction of particle size by trituration only
Increasing the beyond-use date
Uniform mixing of a small amount of potent drug with a larger amount of diluent (Correct answer)
Sterilization of the final product

Correct answer: Uniform mixing of a small amount of potent drug with a larger amount of diluent

Geometric dilution ensures uniform distribution of a small quantity of potent drug throughout a larger diluent base.

Question 18: Which of the following is/are appropriate for skin/soft tissue infections caused by pseudomonas?

Vancomycin
Cefazolin
Cefepime (Correct answer)
Ertapenem

Correct answer: Cefepime

Cefepime is a fourth-generation cephalosporin antibiotic known for its broad spectrum of activity, which includes excellent coverage against Pseudomonas aeruginosa. For skin and soft tissue infections where Pseudomonas is a suspected or confirmed pathogen, an agent with specific anti-pseudomonal activity is required. Cefepime is an appropriate choice due to its efficacy and ability to penetrate infected tissues.

Question 19: A patient on an MAOI must avoid which food to prevent hypertensive crisis?

White rice
Skim milk
Aged cheese (Correct answer)
Fresh fruit

Correct answer: Aged cheese

Tyramine-rich foods like aged cheese can trigger a hypertensive crisis with MAOIs.

Question 20: What proportion of the sample is found within two standard deviations of the mean in a normal distribution?

95%
100%
78%
95% (Correct answer)

Correct answer: 95%

In a normal distribution, also known as a Gaussian distribution, a specific proportion of data falls within certain standard deviations from the mean. According to the empirical rule (or 68-95-99.7 rule), approximately 68% of data falls within one standard deviation, and approximately 95% of the data falls within two standard deviations of the mean. This is a fundamental concept in statistics.

Question 21: What best describes the action of sacubitril in sacubitril/valsartan?

ACE inhibition
Neprilysin inhibition increasing natriuretic peptides (Correct answer)
Aldosterone receptor antagonism
Beta-1 receptor blockade

Correct answer: Neprilysin inhibition increasing natriuretic peptides

Sacubitril inhibits neprilysin, raising beneficial natriuretic peptide levels.

Question 22: Heparin produces anticoagulation primarily by:

Blocking platelet GP IIb/IIIa
Enhancing antithrombin III activity (Correct answer)
Directly inhibiting thrombin without a cofactor
Inhibiting vitamin K epoxide reductase

Correct answer: Enhancing antithrombin III activity

Unfractionated heparin potentiates antithrombin III, which inactivates thrombin and factor Xa.

Question 23: GLP-1 receptor agonists (e.g., semaglutide) lower glucose by:

Inhibiting DPP-4 directly
Blocking SGLT2
Enhancing glucose-dependent insulin secretion and slowing gastric emptying (Correct answer)
Inhibiting alpha-glucosidase

Correct answer: Enhancing glucose-dependent insulin secretion and slowing gastric emptying

GLP-1 agonists augment glucose-dependent insulin release, suppress glucagon, and slow gastric emptying.

Question 24: Which metabolic adverse effect most commonly results from long-term systemic corticosteroid therapy?

Primary hypothyroidism
Hypercalcemia
Dilutional hyponatremia
Hyperglycemia and steroid-induced diabetes (Correct answer)

Correct answer: Hyperglycemia and steroid-induced diabetes

Corticosteroids stimulate hepatic gluconeogenesis, impair insulin signaling at peripheral tissues, and promote glycogenolysis, collectively causing hyperglycemia that can progress to steroid-induced diabetes mellitus.

Question 25: A pharmacist is explaining a new, complex insulin regimen to an elderly patient who appears to be nodding along but seems hesitant. Which of the following is the BEST approach to confirm the patient's understanding?

Ask a family member to come in to ensure the instructions are followed correctly.
Provide the patient with a large-print handout that reviews all the steps.
Say, "Just to be sure I did a good job explaining, can you tell me in your own words how you will take your insulin?" (Correct answer)
Ask the patient, "Do you have any questions about these instructions?"

Correct answer: Say, "Just to be sure I did a good job explaining, can you tell me in your own words how you will take your insulin?"

This is an example of the teach-back method. It is a non-shaming way to assess a patient's understanding by asking them to explain the instructions in their own words. It places the responsibility on the pharmacist for clear communication ("to be sure I did a good job explaining"). Asking "Do you have any questions?" often elicits a simple "no" response, even if the patient is confused. While handouts and family involvement are helpful aids, they do not directly confirm the patient's own comprehension in the moment.

Question 26: A prescription for a pediatric patient weighing 44 lbs is for amoxicillin 30 mg/kg/day, divided into two daily doses. The pharmacy has amoxicillin oral suspension with a concentration of 250 mg/5 mL. How many mL should be dispensed for each dose?

7.5 mL
6 mL (Correct answer)
12 mL
15 mL

Correct answer: 6 mL

First, convert the patient's weight from pounds to kilograms: 44 lbs / 2.2 lbs/kg = 20 kg. Next, calculate the total daily dose in mg: 20 kg * 30 mg/kg/day = 600 mg/day. Since the dose is divided into two daily doses, each dose is 600 mg / 2 = 300 mg. Finally, calculate the volume in mL for each dose using the suspension's concentration: (300 mg / 250 mg) * 5 mL = 6 mL.

Question 27: A hospital pharmacy is implementing new safety protocols for U-500 regular insulin, a high-alert medication. Which of the following strategies is the MOST critical to prevent a catastrophic dosing error?

Applying an auxiliary label that states 'High-Alert Medication' to the vial before dispensing.
Requiring a mandatory pharmacist-led education session for all new nursing staff.
Dispensing U-500 insulin only with U-500 specific syringes or dedicated pens. (Correct answer)
Storing U-500 insulin vials in a separate, clearly labeled bin in the main pharmacy refrigerator.

Correct answer: Dispensing U-500 insulin only with U-500 specific syringes or dedicated pens.

U-500 insulin is five times more concentrated than standard U-100 insulin. The greatest risk of error comes from accidentally measuring a U-500 dose using a standard U-100 syringe, which can lead to a 5-fold overdose. Therefore, the most critical safety measure is to eliminate this possibility by dispensing U-500 insulin ONLY with syringes calibrated specifically for it or in its own dedicated pen device. While storage, education, and labels are important, they are less effective at preventing this specific, high-risk error than using the correct administration device.

Question 28: On a patient weighing 125 pounds, an order for heparin 18 units per kg per hour is received. The IV bag has a 50-unit-per-milliliter concentration. Calculate the rate of infusion in mL/hr.

18 mls/hr
20.45 mls/hr (Correct answer)
40.9 mls/hr
10.23 mls/hr

Correct answer: 20.45 mls/hr

First, convert the patient's weight from pounds to kilograms: 125 lbs / 2.2 lbs/kg = 56.82 kg. Next, calculate the total heparin units needed per hour: 18 units/kg/hr * 56.82 kg = 1022.76 units/hr. Finally, divide the total units per hour by the concentration of the IV bag to find the infusion rate in mL/hr: 1022.76 units/hr / 50 units/mL = 20.4552 mL/hr, which rounds to 20.45 mL/hr.

Question 29: Which mechanism describes the action of allopurinol in gout?

Inhibition of xanthine oxidase reducing uric acid production (Correct answer)
Inhibiting cyclooxygenase
Increasing renal uric acid excretion
Inhibiting leukocyte migration

Correct answer: Inhibition of xanthine oxidase reducing uric acid production

Allopurinol inhibits xanthine oxidase, lowering uric acid synthesis.

Question 30: A technician is preparing to compound an IV infusion of cyclophosphamide, a hazardous drug. According to USP <800> guidelines, which of the following personal protective equipment (PPE) is required for this task?

An N95 respirator and a single pair of chemotherapy gloves.
Two pairs of chemotherapy-rated gloves and a disposable, impermeable gown. (Correct answer)
A single pair of non-sterile gloves and a cloth lab coat.
A surgical mask and a reusable gown.

Correct answer: Two pairs of chemotherapy-rated gloves and a disposable, impermeable gown.

USP <800> mandates specific PPE for handling hazardous drugs to minimize exposure. This includes wearing two pairs of chemotherapy gloves that meet ASTM D6978 standards and a disposable gown that is impermeable to hazardous drugs and closes in the back. Single pairs of gloves, cloth coats, or standard surgical masks do not provide adequate protection. While respiratory protection may be needed, it is part of a larger set of required PPE.

Question 31: In patients with heart failure, which of the following medications should be avoided?

All of the above (Correct answer)
Celebrex
Naproxen
Pioglitazone

Correct answer: All of the above

All the listed medications should be avoided or used with extreme caution in patients with heart failure. Pioglitazone (a thiazolidinedione) can cause significant fluid retention, exacerbating heart failure symptoms. Naproxen and Celebrex (NSAIDs) can also lead to fluid retention, increased blood pressure, and impaired renal function, all of which can worsen heart failure. Thus, all these drugs pose risks in this patient population.

Question 32: A patient on a medical-surgical unit experienced a severe hypoglycemic event. A root cause analysis (RCA) revealed the patient received glipizide instead of glyburide, which had been ordered. The investigation found that the two drugs were stored in adjacent bins in the automated dispensing cabinet (ADC) on the nursing unit. Which of the following interventions represents the strongest system-based change to prevent this error from recurring?

Requiring two nurses to verify all sulfonylurea administrations.
Placing a high-alert warning sticker on the glyburide and glipizide bins.
Educating all nursing staff on the differences between glipizide and glyburide during the next staff meeting.
Implementing barcode scanning for medication removal from the ADC and at the bedside. (Correct answer)

Correct answer: Implementing barcode scanning for medication removal from the ADC and at the bedside.

While education, warnings, and double-checks are helpful, the strongest system-based intervention is one that uses a forcing function or technology to prevent the error. Implementing barcode scanning at two key points—when removing the medication from the ADC and before administration at the bedside—creates an automated check that verifies the drug against the patient's electronic medication administration record (eMAR). This is more reliable and less prone to human error than manual checks, warning labels, or education alone.

Question 33: A patient with bipolar disorder maintained on lithium develops a viral illness with vomiting and dehydration. What is the main concern in the treatment plan?

Dehydration can raise lithium levels and cause toxicity (Correct answer)
Lithium absorption will be enhanced and safer
There is no interaction with hydration status
Lithium will become subtherapeutic and ineffective

Correct answer: Dehydration can raise lithium levels and cause toxicity

Volume depletion increases lithium reabsorption and can precipitate toxicity, so levels and hydration must be monitored.

Question 34: A pharmacist needs to compound an ointment containing 100 mg of a potent corticosteroid powder using 19.9 g of a petrolatum base. To ensure the active ingredient is uniformly distributed, which of the following compounding techniques is most appropriate?

Spatulation on an ointment slab without any specific order
Levigation with a volatile solvent
Tumbling in a motorized mixer for 10 minutes
Geometric dilution (Correct answer)

Correct answer: Geometric dilution

Geometric dilution is the process of thoroughly mixing a small amount of a potent drug with a large amount of a diluent. The process involves mixing the smaller quantity of powder (the corticosteroid) with an approximately equal quantity of the diluent (petrolatum base). This mixture is then combined with an equal portion of the diluent, and the process is repeated until all the diluent is incorporated. This ensures the final product is homogeneous.

Question 35: Which receptor does ondansetron antagonize to prevent nausea?

H1 histamine receptor
5-HT3 serotonin receptor (Correct answer)
NK1 substance P receptor
D2 dopamine receptor

Correct answer: 5-HT3 serotonin receptor

Ondansetron blocks 5-HT3 receptors centrally and in the GI tract.

Question 36: Per USP <797>, the buffer area (where the PEC sits) should maintain what minimum ISO classification?

ISO Class 8
ISO Class 7 (Correct answer)
ISO Class 5
ISO Class 6

Correct answer: ISO Class 7

The buffer area housing the primary engineering control must be at least ISO Class 7.

Question 37: A pharmacist receives an electronic prescription for a Schedule II controlled substance. According to federal law, which of the following is an essential responsibility of the pharmacist before dispensing?

Ensuring the prescription is for a legitimate medical purpose by a practitioner acting in the usual course of professional practice. (Correct answer)
Verifying the prescription was transmitted using a two-factor authentication method by the prescriber.
Confirming the patient's diagnosis is a legitimate indication for the prescribed medication.
Ensuring the patient has not received a similar prescription from another prescriber within the last 30 days.

Correct answer: Ensuring the prescription is for a legitimate medical purpose by a practitioner acting in the usual course of professional practice.

The fundamental responsibility of a pharmacist dispensing any controlled substance is to ensure its legitimacy. According to the Code of Federal Regulations (21 CFR), a prescription for a controlled substance must be issued for a legitimate medical purpose by a practitioner acting in the usual course of his or her professional practice. The pharmacist has a corresponding responsibility to ensure this is the case. While checking PMPs (A), understanding indications (C), and being aware of EPCS security features (B) are parts of good practice, the overarching legal and professional responsibility is to validate the prescription's overall legitimacy.

Question 38: A patient is to receive 1 liter of D5W over 10 hours. The IV administration set delivers 15 gtt/mL. What is the flow rate in drops per minute (gtt/min)?

17 gtt/min
30 gtt/min
21 gtt/min
25 gtt/min (Correct answer)

Correct answer: 25 gtt/min

First, calculate the flow rate in mL/hr: 1000 mL / 10 hours = 100 mL/hr. Next, convert mL/hr to mL/min: 100 mL/hr / 60 min/hr = 1.67 mL/min. Finally, calculate the flow rate in gtt/min using the drop factor: 1.67 mL/min * 15 gtt/mL = 25 gtt/min.

Question 39: What documentation must legally be provided to patients before vaccination in the US?

Pharmacy license
Insurance card
A prescription copy
Vaccine Information Statement (VIS) (Correct answer)

Correct answer: Vaccine Information Statement (VIS)

Federal law requires that a current Vaccine Information Statement be provided before administering covered vaccines.

Question 40: A patient on warfarin needs an antibiotic. Which choice carries the HIGHEST risk of increasing INR?

Cephalexin
Azithromycin
Nitrofurantoin
Trimethoprim-sulfamethoxazole (Correct answer)

Correct answer: Trimethoprim-sulfamethoxazole

Trimethoprim-sulfamethoxazole inhibits CYP2C9 and displaces warfarin from protein, markedly raising INR.

Question 41: Which laboratory value should be monitored when initiating vancomycin therapy?

TSH
Serum trough and renal function (Correct answer)
Lipase
INR

Correct answer: Serum trough and renal function

Vancomycin requires trough or AUC monitoring and renal function assessment due to nephrotoxicity.

Question 42: The antiplatelet effect of clopidogrel requires which step?

Inhibition of cyclooxygenase-1
Conversion by gut bacteria
Direct reversible binding to P2Y12
CYP2C19 activation to its active metabolite (Correct answer)

Correct answer: CYP2C19 activation to its active metabolite

Clopidogrel is a prodrug activated mainly by CYP2C19; poor metabolizers respond less.

Question 43: Which mechanism underlies the bronchodilation of tiotropium?

Beta-2 agonism
Leukotriene receptor blockade
Mast cell stabilization
Long-acting muscarinic receptor antagonism (Correct answer)

Correct answer: Long-acting muscarinic receptor antagonism

Tiotropium is a LAMA that blocks muscarinic receptors in airway smooth muscle.

Question 44: The mechanism of action of fluoroquinolones (e.g., levofloxacin) is:

Inhibition of RNA polymerase
Inhibition of the 50S ribosome
Disruption of cell wall synthesis
Inhibition of DNA gyrase and topoisomerase IV (Correct answer)

Correct answer: Inhibition of DNA gyrase and topoisomerase IV

Fluoroquinolones inhibit bacterial DNA gyrase and topoisomerase IV, blocking DNA replication.

Question 45: Which of the following describes the correct order of garbing procedures for a pharmacist entering a sterile compounding cleanroom suite, according to general USP <797> principles?

Don gown, don sterile gloves, perform hand hygiene, then don shoe and hair covers.
Perform hand hygiene, don gown, don shoe and hair covers, then don sterile gloves.
Don sterile gloves, perform hand hygiene, don gown, then don shoe and hair covers.
Don shoe covers, head/hair covers, and mask; perform hand hygiene; don gown; apply hand sanitizer; don sterile gloves. (Correct answer)

Correct answer: Don shoe covers, head/hair covers, and mask; perform hand hygiene; don gown; apply hand sanitizer; don sterile gloves.

USP <797> requires a specific garbing sequence to minimize contamination, proceeding from dirtiest to cleanest activities. Personnel first don shoe covers, head/hair covers, and a face mask in the ante-area. This is followed by hand hygiene. A non-shedding gown is donned next. Upon entering the buffer area, an alcohol-based hand rub is used before donning sterile gloves as the final step before compounding.

Question 46: Which drug class can cause hyperkalemia due to aldosterone antagonism?

Potassium-sparing diuretics (Correct answer)
Thiazide diuretics
Loop diuretics
Carbonic anhydrase inhibitors

Correct answer: Potassium-sparing diuretics

Spironolactone and similar agents block aldosterone, retaining potassium.

Question 47: A patient starting allopurinol for gout should be counseled that it does what?

Relieves acute gout pain within minutes
Requires no fluid intake
Lowers uric acid over time and may initially trigger flares (Correct answer)
Should be stopped at the first sign of any flare

Correct answer: Lowers uric acid over time and may initially trigger flares

Allopurinol is a urate-lowering maintenance therapy that can precipitate flares early on.

Question 48: What is the maximum recommended daily acetaminophen dose for most adults?

8 grams
4 grams (Correct answer)
6 grams
2 grams

Correct answer: 4 grams

The general adult ceiling is 4 grams per day, with lower limits in hepatic impairment or chronic alcohol use.

Question 49: A patient starting warfarin asks about diet. What is the most appropriate counseling point?

Avoid all foods containing vitamin K entirely
Double the dose on days you eat leafy greens
Take warfarin with grapefruit juice to boost effect
Keep vitamin K intake consistent rather than eliminating it (Correct answer)

Correct answer: Keep vitamin K intake consistent rather than eliminating it

Consistency of vitamin K intake matters more than avoidance, since sudden changes alter INR.

Question 50: Dabigatran differs from apixaban in that it:

Requires antithrombin as a cofactor
Directly inhibits thrombin (IIa) (Correct answer)
Inhibits factor Xa
Antagonizes vitamin K

Correct answer: Directly inhibits thrombin (IIa)

Dabigatran is a direct thrombin inhibitor, reversed by idarucizumab.

Question 51: Which agent is most commonly used to disinfect the work surfaces of a laminar airflow hood before compounding?

Sterile water for injection
3% hydrogen peroxide
10% povidone-iodine
Sterile 70% isopropyl alcohol (Correct answer)

Correct answer: Sterile 70% isopropyl alcohol

Sterile 70% isopropyl alcohol is the standard surface disinfectant for the PEC.

Question 52: A pharmacist is counseling a 19-year-old female patient who is picking up her first prescription for isotretinoin. According to the iPLEDGE REMS program, which of the following is an absolute requirement that must be communicated?

The patient must report any signs of depression or mood changes immediately.
The patient should avoid excessive sun exposure and use a broad-spectrum sunscreen.
The patient must not donate blood during therapy and for one month after stopping.
The patient must use two forms of effective contraception simultaneously or commit to continuous abstinence. (Correct answer)

Correct answer: The patient must use two forms of effective contraception simultaneously or commit to continuous abstinence.

The primary goal of the iPLEDGE REMS program is to prevent fetal exposure to isotretinoin due to its severe teratogenicity. Therefore, the most critical counseling point for a female patient who can become pregnant is the mandatory requirement to use two forms of effective contraception simultaneously (or to be abstinent) for one month before, during, and one month after therapy. The other points are important safety warnings but are not the central focus of the REMS program.

Question 53: A patient on warfarin presents with an INR of 6.5 and no bleeding. What is the most appropriate management?

Increase the warfarin dose
Hold warfarin and consider low-dose oral vitamin K (Correct answer)
Transfuse fresh frozen plasma immediately
Administer IV vitamin K and 4-factor PCC

Correct answer: Hold warfarin and consider low-dose oral vitamin K

For an elevated INR without bleeding, holding warfarin with possible low-dose oral vitamin K is appropriate; aggressive reversal is reserved for serious bleeding.

Question 54: A patient with COPD on a long-acting beta agonist remains symptomatic. Which add-on is most appropriate?

A short course of decongestant
An oral antibiotic course
A long-acting muscarinic antagonist (Correct answer)
A daily systemic steroid indefinitely

Correct answer: A long-acting muscarinic antagonist

Adding a LAMA to a LABA improves symptom control in COPD per guideline-based escalation.

Question 55: A patient with depression on an SSRI is started on tramadol for pain. What risk should be communicated?

Hyperthyroidism
Severe hypoglycemia
Acute gout
Serotonin syndrome (Correct answer)

Correct answer: Serotonin syndrome

Combining serotonergic agents like SSRIs and tramadol increases the risk of serotonin syndrome.

Question 56: A levigating agent is used in non-sterile compounding to do what?

Reduce particle gritiness when incorporating a solid into an ointment base (Correct answer)
Sterilize the ointment
Act as the main active ingredient
Increase the melting point of the base

Correct answer: Reduce particle gritiness when incorporating a solid into an ointment base

A levigating agent such as mineral oil or glycerin wets and reduces the grittiness of solid particles in an ointment or paste.

Question 57: A patient with a history of bilateral renal artery stenosis presents with newly diagnosed hypertension. Which antihypertensive class is most likely to precipitate acute renal failure in this patient?

Beta-1 selective beta-blockers
ACE inhibitors (Correct answer)
Thiazide diuretics
Dihydropyridine calcium channel blockers

Correct answer: ACE inhibitors

In bilateral renal artery stenosis, perfusion of both kidneys depends on angiotensin II–mediated efferent arteriolar constriction. ACE inhibitors block this compensatory mechanism, causing a sharp drop in GFR and acute kidney injury.

Question 58: A patient with seizure disorder and hepatic impairment needs an antiepileptic with minimal hepatic metabolism. Which is most appropriate?

Valproic acid
Carbamazepine
Levetiracetam (Correct answer)
Phenytoin

Correct answer: Levetiracetam

Levetiracetam is primarily renally eliminated and is preferred when hepatic metabolism must be minimized.

Question 59: What is the minimum recommended interval between two doses of MMR vaccine in children?

28 days (Correct answer)
6 months
7 days
12 months

Correct answer: 28 days

The minimum interval between MMR doses is 28 days (4 weeks).

Question 60: Which serious musculoskeletal adverse effect is most strongly associated with fluoroquinolone antibiotics, particularly in elderly patients?

Tendinopathy and tendon rupture (Correct answer)
Avascular necrosis of the femoral head
Osteonecrosis of the jaw
Stress fractures

Correct answer: Tendinopathy and tendon rupture

Fluoroquinolones disrupt tenocyte metabolism and matrix metalloproteinase activity, predisposing tendons — most commonly the Achilles tendon — to degeneration and rupture, especially in older patients and those on corticosteroids.

Question 61: A patient taking metformin is scheduled for a contrast CT scan. What is the appropriate plan?

Hold metformin around contrast and reassess renal function (Correct answer)
Permanently discontinue metformin
Double the metformin dose
Continue metformin without changes

Correct answer: Hold metformin around contrast and reassess renal function

Metformin is held around iodinated contrast to reduce the risk of lactic acidosis if renal function declines.

Question 62: What should a patient be counseled about when starting an ACE inhibitor like lisinopril?

A persistent dry cough may occur and should be reported (Correct answer)
It commonly causes hyperglycemia
Take potassium supplements routinely
It must be taken with grapefruit

Correct answer: A persistent dry cough may occur and should be reported

A dry cough is a recognized ACE inhibitor side effect that may prompt a switch to an ARB.

Question 63: Which agent should be avoided in a patient with a sulfa allergy who needs a diuretic, when caution is warranted?

Spironolactone
Amiloride
Ethacrynic acid
Hydrochlorothiazide (Correct answer)

Correct answer: Hydrochlorothiazide

Thiazides contain a sulfonamide moiety and warrant caution in patients with sulfa hypersensitivity.

Question 64: When using a horizontal laminar airflow hood, why should objects never be placed between the HEPA filter and a sterile item?

It reduces the humidity needed for sterility
It causes the HEPA filter to expire faster
It blocks airflow and creates downstream contamination zones (Correct answer)
It increases the temperature of the hood

Correct answer: It blocks airflow and creates downstream contamination zones

Objects upstream disrupt first air, creating zones of turbulence and contamination shadows downstream.

Question 65: Which vaccine is contraindicated in a severely immunocompromised patient?

Inactivated influenza
Pneumococcal (PCV15)
Tdap
Live attenuated zoster (Zostavax) (Correct answer)

Correct answer: Live attenuated zoster (Zostavax)

Live vaccines like the older zoster vaccine are contraindicated in severe immunosuppression.

Question 66: Which drug increases insulin secretion by closing pancreatic K-ATP channels?

Acarbose
Empagliflozin
Pioglitazone
Glipizide (sulfonylurea) (Correct answer)

Correct answer: Glipizide (sulfonylurea)

Sulfonylureas close beta-cell K-ATP channels, depolarizing the cell to trigger insulin release.

Question 67: A batch of parenteral nutrition (PN) solutions is prepared in an ISO 5 primary engineering control located within an ISO 7 buffer room. The compounding involves multiple additions and manipulations. According to the revised USP <797> guidelines, what is the maximum beyond-use date (BUD) for this Compounded Sterile Product (CSP) if it is stored in a refrigerator?

30 hours
14 days
9 days (Correct answer)
48 hours

Correct answer: 9 days

The revised USP <797> categorizes CSPs based on the environment in which they are compounded rather than by low, medium, or high risk. A CSP prepared in an ISO 5 PEC within an ISO 7 buffer room is considered a Category 2 CSP. For aseptically processed Category 2 CSPs without sterility testing, the maximum BUD when stored under refrigeration (2°C to 8°C) is 9 days, assuming stability data supports it.

Question 68: Statins lower cholesterol by inhibiting which enzyme?

Squalene synthase
Lipoprotein lipase
HMG-CoA reductase (Correct answer)
PCSK9

Correct answer: HMG-CoA reductase

Statins competitively inhibit HMG-CoA reductase, the rate-limiting enzyme of cholesterol synthesis.

Question 69: A patient with gastroesophageal reflux disease (GERD) is prescribed omeprazole. This drug provides symptom relief primarily by which of the following mechanisms?

Neutralizing existing stomach acid
Forming a protective barrier over the gastric mucosa
Blocking histamine H2-receptors on parietal cells
Irreversibly inhibiting the H+/K+ ATPase pump in parietal cells (Correct answer)

Correct answer: Irreversibly inhibiting the H+/K+ ATPase pump in parietal cells

Omeprazole is a proton pump inhibitor (PPI) that specifically and irreversibly blocks the H+/K+ ATPase enzyme system (the 'proton pump') on the secretory surface of gastric parietal cells. This action inhibits the final step in gastric acid production.

Question 70: A patient on a DOAC needs an urgent reversal before emergency surgery. Which reversal agent matches dabigatran?

Andexanet alfa
Vitamin K
Idarucizumab (Correct answer)
Protamine

Correct answer: Idarucizumab

Idarucizumab is the specific reversal agent for the direct thrombin inhibitor dabigatran.

Question 71: What is the weight of 1000 mL of 1.27 specific gravity serum protein?

1.27gm
1270 gm (Correct answer)
127mg
12.7gm

Correct answer: 1270 gm

Specific gravity (SG) is a dimensionless quantity that represents the ratio of a substance's density to the density of water (approximately 1 g/mL). If the specific gravity of serum protein is 1.27, its density is 1.27 g/mL. To find the weight of 1000 mL, you multiply the density by the volume: 1.27 g/mL * 1000 mL = 1270 grams.

Question 72: Which agent is first-line for acute anaphylaxis?

Oral prednisone
IV diphenhydramine
IM epinephrine (Correct answer)
Nebulized albuterol

Correct answer: IM epinephrine

Intramuscular epinephrine into the anterolateral thigh is the immediate first-line treatment for anaphylaxis.

Question 73: Phenytoin exerts its antiseizure effect mainly by:

Blocking voltage-gated sodium channels (Correct answer)
Antagonizing NMDA receptors
Blocking T-type calcium channels
Enhancing GABA-A chloride influx

Correct answer: Blocking voltage-gated sodium channels

Phenytoin stabilizes inactivated sodium channels, reducing repetitive neuronal firing.

Question 74: A prescription is written for aminophylline 300 mg tablets, with a direction of 'Take 1 tablet TID for 10 days'. The bioavailability of aminophylline is 80% of theophylline. How many milligrams of theophylline will the patient receive from a single dose?

300 mg
240 mg (Correct answer)
60 mg
375 mg

Correct answer: 240 mg

Each tablet contains 300 mg of aminophylline. To find the equivalent amount of theophylline, you must account for the salt factor. Aminophylline is approximately 80% theophylline by weight. Therefore, the amount of theophylline in one 300 mg aminophylline tablet is: 300 mg aminophylline * 0.80 = 240 mg of theophylline. The frequency and duration are not needed to answer the specific question about a single dose.

Question 75: A patient with heterozygous familial hypercholesterolemia is prescribed alirocumab. What is the primary mechanism of action of this medication?

It blocks the intestinal absorption of cholesterol by inhibiting the Niemann-Pick C1-Like 1 (NPC1L1) protein.
It binds to proprotein convertase subtilisin/kexin type 9 (PCSK9), preventing its interaction with LDL receptors. (Correct answer)
It directly inhibits HMG-CoA reductase in the liver, reducing cholesterol synthesis.
It activates peroxisome proliferator-activated receptor alpha (PPAR-α), increasing lipoprotein lipase activity.

Correct answer: It binds to proprotein convertase subtilisin/kexin type 9 (PCSK9), preventing its interaction with LDL receptors.

Alirocumab is a monoclonal antibody that targets and inhibits PCSK9. Normally, PCSK9 binds to LDL receptors on hepatocytes, promoting their degradation. By inhibiting PCSK9, alirocumab prevents this degradation, leading to an increased number of LDL receptors on the liver cell surface, which enhances the clearance of LDL cholesterol from the circulation.

Question 76: A 68-year-old male with a history of type 2 diabetes, hypertension, and a previous myocardial infarction presents to the pharmacy with a new prescription for sitagliptin 100 mg daily. His current medication list includes metformin 1000 mg BID, lisinopril 20 mg daily, metoprolol succinate 100 mg daily, aspirin 81 mg daily, and atorvastatin 40 mg daily. His most recent lab results show a SCr of 1.7 mg/dL and an eGFR of 38 mL/min/1.73m². Which of the following represents the most significant drug therapy problem?

Atorvastatin is contraindicated in patients with diabetes.
The sitagliptin dose is too high for the patient's renal function. (Correct answer)
Metoprolol may mask signs of hypoglycemia.
There is a therapeutic duplication with metformin and sitagliptin.

Correct answer: The sitagliptin dose is too high for the patient's renal function.

The patient's estimated glomerular filtration rate (eGFR) is 38 mL/min/1.73m², indicating moderate chronic kidney disease. The standard dose of sitagliptin is 100 mg daily for patients with an eGFR > 45 mL/min/1.73m². For an eGFR between 30 and 45, the dose should be reduced to 50 mg daily. Therefore, the prescribed dose of 100 mg is inappropriate and poses a safety risk. While metoprolol can mask some signs of hypoglycemia, and metformin/sitagliptin is a common combination, the most immediate and actionable problem is the inappropriate dosing of sitagliptin based on renal function.

Question 77: Jen is an 75-year-old woman who is undergoing back surgery. Her height is 5 feet 4 inches, her weight is 85 kg, and NKDA. Hypertension, diabetes, serious depression, hypothyroidism, and persistent back pain are among her former medical conditions. Jen's post-op medications include Dexamethasone 8mg iv q6h with taper dose, Ondansetron 4mg iv q6h prn for N/V, and Ondansetron 4mg iv q6h prn for N/V. Bisacodyl 10mg suppository daily prn for constipation, Famotidine 20mg iv q12hr, Levothyroxine 0.075mg po daily, Lisinopril 10mg po daily, Citalopram 20mg po daily, Docusate sodium / Senna 1 tab po twice a day, Bisacodyl 10mg suppository daily prn for constipation, Famotidine 20m, D51/2NS with 20K at 125mls/hour and Hydromorphone PCA at 0.2mg/hour of basal rate, demand dosage 0.1mg, metoclopramide 10mg iv q6h, metformin 500mg po bid, D51/2NS with 20K at 125mls/hour and Hydromorphone PCA at 0.2mg/hour of basal rate, demand dose 0.1mg Lockout every 6 minutes, with a one-hour limit of 2.2 mg/hr. Morning labs include serum creatinine 1.4 mg/dl, magnesium 1.5 mg/dl, potassium 5.0 mmol/L, and sodium 135 mmol/L. <br/> Why is it suggested that people using chronic metformin have their total blood count monitored?

Metformin may decreases erythropoietin level
Metformin may decrease iron absorption
Metformin may decreases vitamin B12 levels (Correct answer)
Metformin may cause leukocytosis

Correct answer: Metformin may decreases vitamin B12 levels

Long-term use of metformin, a medication for type 2 diabetes, can interfere with the absorption of vitamin B12 in the gastrointestinal tract. This can lead to vitamin B12 deficiency, which is crucial for red blood cell formation. Consequently, monitoring a patient's total blood count (CBC) is recommended to detect potential megaloblastic anemia, a hematological manifestation of B12 deficiency, allowing for timely supplementation if needed.

Question 78: A patient on warfarin starts amiodarone. What is the primary mechanism of the resulting increased INR?

Displacement of warfarin from albumin only
Induction of vitamin K epoxide reductase
Inhibition of CYP2C9 metabolism of warfarin (Correct answer)
Increased renal clearance of warfarin

Correct answer: Inhibition of CYP2C9 metabolism of warfarin

Amiodarone inhibits CYP2C9 (and CYP3A4), reducing warfarin metabolism and raising INR.

Question 79: A child experiencing an acute asthma exacerbation is administered albuterol via a nebulizer. The therapeutic effect of this medication is achieved through which mechanism?

Inhibition of leukotriene synthesis
Stimulation of beta-2 adrenergic receptors causing smooth muscle relaxation (Correct answer)
Antagonism of muscarinic receptors leading to bronchodilation
Stabilization of mast cell membranes

Correct answer: Stimulation of beta-2 adrenergic receptors causing smooth muscle relaxation

Albuterol is a selective beta-2 adrenergic receptor agonist. Stimulation of these receptors in the lungs leads to the relaxation of bronchial smooth muscle, resulting in bronchodilation and relief of bronchospasm.

Question 80: When counseling a patient on the proper use of a new albuterol metered-dose inhaler (MDI), which of the following steps is most frequently performed incorrectly by patients and should be a point of emphasis?

Failing to shake the inhaler well before each use.
Forgetting to wash the plastic actuator weekly.
Neglecting to rinse their mouth out with water after use.
Not coordinating a slow, deep breath with pressing the canister. (Correct answer)

Correct answer: Not coordinating a slow, deep breath with pressing the canister.

Studies show that one of the most common and critical errors in MDI technique is poor coordination between actuating (pressing) the canister and starting a slow, deep inhalation. This leads to the medication impacting the back of the throat instead of reaching the lungs. While shaking the inhaler is important and rinsing the mouth is vital for inhaled corticosteroids, poor timing of the breath is a more frequent cause of treatment failure for rescue inhalers like albuterol.

Question 81: A pharmacist needs to prepare 120 g of a 1.5% hydrocortisone cream. The pharmacy has 2.5% and 0.5% hydrocortisone creams in stock. How many grams of the 2.5% cream are needed?

60 g (Correct answer)
45 g
90 g
30 g

Correct answer: 60 g

This is an alligation problem. Set up the alligation grid. The desired percentage (1.5%) is in the center. The higher concentration (2.5%) is in the top left, and the lower concentration (0.5%) is in the bottom left. Subtract diagonally: 2.5 - 1.5 = 1 (part of 0.5% cream) and 1.5 - 0.5 = 1 (part of 2.5% cream). The ratio of 2.5% cream to 0.5% cream is 1:1. The total number of parts is 1 + 1 = 2. To find the amount of 2.5% cream needed: (1 part / 2 total parts) * 120 g = 60 g.

Question 82: A patient on digoxin presents with nausea, visual halos, and a level of 2.8 ng/mL. What is the best action?

Add a beta blocker
Increase the digoxin dose
Continue and recheck in a month
Hold digoxin and check potassium (Correct answer)

Correct answer: Hold digoxin and check potassium

Digoxin toxicity (level >2 ng/mL with symptoms) requires holding the drug and assessing potassium.

Question 83: You are asked to compound 240 mL of a 250 mg/5 mL amoxicillin suspension. The pharmacy only has amoxicillin 400 mg/5 mL suspension and a suitable cherry-flavored syrup for dilution. How much of the 400 mg/5 mL suspension is required?

200 mL
180 mL
120 mL
150 mL (Correct answer)

Correct answer: 150 mL

Use the dilution formula C1V1 = C2V2. C1 = 400 mg/5 mL, V1 = ?, C2 = 250 mg/5 mL, V2 = 240 mL. To simplify, you can use the concentrations directly: (400 mg/5 mL) * V1 = (250 mg/5 mL) * 240 mL. The ' /5 mL' term cancels out. So, 400 * V1 = 250 * 240. V1 = (250 * 240) / 400. V1 = 60000 / 400. V1 = 150 mL.

Question 84: A patient presents with a deep, dirty wound and an unknown tetanus history. What should be administered?

Tetanus immune globulin only
Tetanus toxoid-containing vaccine plus tetanus immune globulin (Correct answer)
Antibiotics only
No intervention needed

Correct answer: Tetanus toxoid-containing vaccine plus tetanus immune globulin

For dirty wounds with uncertain vaccination history, both a tetanus toxoid-containing vaccine and tetanus immune globulin are indicated.

Question 85: A patient with Helicobacter pylori-associated peptic ulcer disease and no penicillin allergy should receive which regimen?

An H2 blocker plus sucralfate
A PPI alone for 8 weeks
A single antibiotic with a PPI
Clarithromycin triple therapy or bismuth quadruple therapy (Correct answer)

Correct answer: Clarithromycin triple therapy or bismuth quadruple therapy

Eradication of H. pylori requires combination therapy such as clarithromycin triple or bismuth quadruple therapy.

Question 86: A patient with a CrCl of 28 mL/min is currently taking metformin 1000 mg twice daily for type 2 diabetes. What is the most appropriate action?

Switch metformin to extended-release formulation to improve renal tolerance
Continue metformin at the current dose and recheck renal function in 3 months
Discontinue metformin due to risk of lactic acidosis (Correct answer)
Reduce the metformin dose to 500 mg twice daily

Correct answer: Discontinue metformin due to risk of lactic acidosis

Metformin is contraindicated when CrCl falls below 30 mL/min because impaired renal clearance leads to drug accumulation and a dangerous risk of lactic acidosis. Dose reduction is not sufficient at this level — the drug must be discontinued.

Question 87: Which of the following statements most accurately describes the pharmacological mechanism of selective serotonin reuptake inhibitors (SSRIs) like sertraline?

They block postsynaptic serotonin 5-HT2A receptors while also inhibiting serotonin reuptake.
They inhibit both serotonin and norepinephrine reuptake transporters with high affinity.
They inhibit the enzyme monoamine oxidase, preventing the breakdown of serotonin.
They selectively block the presynaptic serotonin transporter (SERT), increasing serotonin concentration in the synaptic cleft. (Correct answer)

Correct answer: They selectively block the presynaptic serotonin transporter (SERT), increasing serotonin concentration in the synaptic cleft.

SSRIs, as their name implies, work by specifically and selectively inhibiting the serotonin transporter (SERT) on the presynaptic neuron. This action reduces the reuptake of serotonin from the synapse, which leads to an increased concentration and prolonged availability of serotonin to bind with postsynaptic receptors.

Question 88: Which antihypertensive is preferred in a pregnant patient with chronic hypertension?

Labetalol (Correct answer)
Spironolactone
Lisinopril
Losartan

Correct answer: Labetalol

Labetalol is considered safe in pregnancy, whereas ACE inhibitors and ARBs are contraindicated.

Question 89: What is the purpose of a 0.22-micron filter in sterile compounding?

Adding preservatives
Concentrating the drug
Sterilizing filtration to remove bacteria from a solution (Correct answer)
Removing dissolved gases

Correct answer: Sterilizing filtration to remove bacteria from a solution

A 0.22-micron filter provides sterilizing-grade filtration by removing bacteria from a solution.

Question 90: A pharmacy's vaccine refrigerator experiences a power failure overnight. In the morning, the digital data logger shows the temperature has been 11°C (51.8°F) for the past 6 hours. The recommended storage temperature is 2°C to 8°C. What is the MOST appropriate initial action for the pharmacist to take?

Administer the vaccines as usual, as the excursion was less than 8 hours.
Label the exposed vaccines "DO NOT USE," move them to a stable refrigerator, and contact the vaccine manufacturers for guidance. (Correct answer)
Immediately discard all vaccines from the affected refrigerator.
Lower the refrigerator's thermostat to its coldest setting to quickly bring the temperature back into range.

Correct answer: Label the exposed vaccines "DO NOT USE," move them to a stable refrigerator, and contact the vaccine manufacturers for guidance.

During a temperature excursion, the CDC recommends that potentially affected vaccines be immediately isolated and marked "DO NOT USE" to prevent their administration. The vaccines should not be discarded. The next critical step is to contact the vaccine manufacturers and/or the state or local immunization program to obtain specific guidance on whether the vaccines are still viable, as stability data varies by product and excursion details.

Question 91: What is the best counseling for a patient prescribed oral tetracycline?

Take immediately after a calcium supplement
Avoid dairy, antacids, and iron near dosing time (Correct answer)
Take with milk for better tolerability
Always take with an antacid

Correct answer: Avoid dairy, antacids, and iron near dosing time

Divalent and trivalent cations chelate tetracyclines and reduce absorption.

Question 92: Beta-blockers reduce heart rate primarily by antagonizing which receptor?

Beta-1 adrenergic receptors (Correct answer)
Alpha-1 adrenergic receptors
Muscarinic M2 receptors
Beta-2 adrenergic receptors

Correct answer: Beta-1 adrenergic receptors

Blocking cardiac beta-1 receptors decreases heart rate and contractility.

Question 93: Which counseling point is correct for a patient prescribed levothyroxine?

Take only when feeling tired
Take on an empty stomach, typically 30-60 minutes before breakfast (Correct answer)
Take at bedtime with a calcium supplement
Take with breakfast and coffee

Correct answer: Take on an empty stomach, typically 30-60 minutes before breakfast

Levothyroxine absorption is best on an empty stomach, separated from food and certain minerals.

Question 94: A patient with gout on chronic urate-lowering therapy has frequent flares during initiation. What preventive plan is appropriate?

Double the allopurinol immediately
Add anti-inflammatory flare prophylaxis such as colchicine (Correct answer)
Stop urate-lowering therapy
Begin high-dose vitamin C

Correct answer: Add anti-inflammatory flare prophylaxis such as colchicine

Flare prophylaxis with colchicine or NSAIDs is recommended when starting urate-lowering therapy.

Question 95: A patient develops a severe egg allergy with anaphylaxis. Which influenza vaccine is preferred?

Live attenuated influenza vaccine
No vaccine at all
Cell-based or recombinant influenza vaccine (Correct answer)
Double-dose egg-based vaccine

Correct answer: Cell-based or recombinant influenza vaccine

Cell-based or recombinant influenza vaccines are egg-free options preferred for patients with severe egg allergy.

Question 96: A technician needs to accurately measure 8 mL of glycerin, a viscous liquid, for a non-sterile compound. Which piece of equipment would provide the most accurate measurement?

A 25 mL graduated cylinder
A 10 mL oral syringe (Correct answer)
A 50 mL conical graduate
A 10 mL beaker

Correct answer: A 10 mL oral syringe

For measuring viscous liquids like glycerin, a syringe is more accurate than a graduated cylinder. Because glycerin is thick, a significant amount can cling to the inner surface of a graduated cylinder, leading to an inaccurate volume being delivered. An oral syringe allows for the complete and forceful expulsion of the liquid, ensuring a more accurate volume is transferred. Beakers and conical graduates are less accurate for measuring small volumes.

Question 97: Which storage condition is correct for most refrigerated vaccines?

Minus 70 degrees Celsius for all
2 to 8 degrees Celsius (Correct answer)
Frozen at 0 degrees Celsius
Room temperature

Correct answer: 2 to 8 degrees Celsius

Most refrigerated vaccines must be stored between 2 and 8 degrees Celsius.

Question 98: Which counseling point is correct for a patient using a topical nitroglycerin or other transdermal patch with a nitrate-free interval?

Wear the patch continuously 24 hours a day
Cut the patch in half for a lower dose
Apply two patches at once
Remove the patch for a daily nitrate-free period to prevent tolerance (Correct answer)

Correct answer: Remove the patch for a daily nitrate-free period to prevent tolerance

A daily nitrate-free interval helps prevent the development of nitrate tolerance.

Question 99: A patient on long-term anticoagulation with warfarin for atrial fibrillation needs to understand how the medication works. Which statement accurately describes warfarin's mechanism of action?

It prevents platelet aggregation by blocking ADP receptors
It potentiates the activity of antithrombin III
It inhibits the activation of vitamin K-dependent clotting factors (Correct answer)
It directly inhibits thrombin (Factor IIa)

Correct answer: It inhibits the activation of vitamin K-dependent clotting factors

Warfarin inhibits the enzyme vitamin K epoxide reductase complex 1 (VKORC1). This action interferes with the activation of vitamin K, which is a necessary cofactor for the synthesis of clotting factors II, VII, IX, and X in the liver.

Question 100: A pharmacist needs to prepare 120 g of a 2.5% hydrocortisone cream by mixing 1% and 5% hydrocortisone creams. How many grams of the 5% cream are required?

45 g (Correct answer)
60 g
30 g
75 g

Correct answer: 45 g

This is an alligation problem. Set up the alligation grid. The desired percentage (2.5%) is in the center. The higher (5%) and lower (1%) concentrations are on the left. Subtract diagonally: 2.5 - 1 = 1.5 (parts of 5% cream) and 5 - 2.5 = 2.5 (parts of 1% cream). The total parts are 1.5 + 2.5 = 4 parts. The proportion of the 5% cream needed is 1.5/4. Calculate the amount needed: (1.5 / 4) * 120 g = 45 g.

Question 101: A pregnant patient at 30 weeks gestation should receive which vaccine to protect the newborn from pertussis?

Tdap (Correct answer)
Varicella
Live attenuated influenza vaccine
MMR

Correct answer: Tdap

Tdap is recommended during each pregnancy, ideally between 27 and 36 weeks, to transfer antibodies and protect the infant from pertussis.

Question 102: A patient with major depression has failed an adequate trial of one SSRI. What is the most appropriate next step?

Add a benzodiazepine as monotherapy
Stop all therapy permanently
Halve the current SSRI dose
Switch to another antidepressant or augment (Correct answer)

Correct answer: Switch to another antidepressant or augment

After an adequate but inadequate SSRI trial, switching agents or augmenting is the guideline-based next step.

Question 103: A patient prescribed oral contraceptives should be told that which medication may reduce their effectiveness?

Acetaminophen
Rifampin (Correct answer)
Loratadine
Vitamin C

Correct answer: Rifampin

Rifampin induces hepatic enzymes and can lower contraceptive hormone levels.

Question 104: A patient taking an ACE inhibitor develops a persistent dry cough without angioedema. What is the best alternative?

Stop all antihypertensives
Add a cough suppressant indefinitely
Increase the ACE inhibitor dose
Switch to an ARB (Correct answer)

Correct answer: Switch to an ARB

ACE inhibitor-induced cough is bradykinin-mediated, and switching to an ARB avoids it while preserving RAAS blockade.

Question 105: According to USP <797>, what is the maximum BUD for a low-risk compounded sterile preparation stored at room temperature?

14 days
6 hours
48 hours (Correct answer)
30 days

Correct answer: 48 hours

Low-risk CSPs may be stored at controlled room temperature for up to 48 hours under traditional <797> default BUDs.

Question 106: SGLT2 inhibitors like empagliflozin lower glucose by:

Blocking glucose reabsorption in the proximal tubule (Correct answer)
Inhibiting alpha-glucosidase
Activating AMPK in the liver
Stimulating pancreatic insulin secretion

Correct answer: Blocking glucose reabsorption in the proximal tubule

SGLT2 inhibitors promote urinary glucose excretion via the proximal tubule.

Question 107: Per USP <797>, what is a beyond-use date (BUD) primarily based on?

Sterility and stability risk of the preparation (Correct answer)
The pharmacist's preference
The patient's insurance coverage period
The expiration date printed on the source vial only

Correct answer: Sterility and stability risk of the preparation

BUDs are assigned based on the risk of microbial contamination and chemical/physical stability of the compounded preparation.

Question 108: Which antibiotic mechanism is associated with inhibition of the 50S ribosomal subunit?

Fluoroquinolones such as ciprofloxacin
Macrolides such as azithromycin (Correct answer)
Aminoglycosides such as gentamicin
Beta-lactams such as amoxicillin

Correct answer: Macrolides such as azithromycin

Macrolides bind the 50S subunit to block bacterial protein synthesis.

Question 109: A patient develops a dry cough on lisinopril. The best alternative within RAAS blockade is:

Metoprolol
Losartan (Correct answer)
Hydrochlorothiazide
Amlodipine

Correct answer: Losartan

An ARB like losartan avoids the bradykinin-mediated cough seen with ACE inhibitors while keeping RAAS blockade.

Question 110: Which statement about metformin counseling is most accurate?

It causes significant weight gain
It commonly causes hypoglycemia as monotherapy
It must be taken on an empty stomach
GI upset is common and improves by taking it with meals (Correct answer)

Correct answer: GI upset is common and improves by taking it with meals

Metformin frequently causes GI side effects that are minimized by taking it with food.

Question 111: A patient taking levothyroxine also begins calcium carbonate supplements. What counseling is needed?

Double the levothyroxine dose
Stop the levothyroxine
Separate administration by at least 4 hours (Correct answer)
Take them together for convenience

Correct answer: Separate administration by at least 4 hours

Calcium binds levothyroxine and reduces absorption, so dosing should be separated by several hours.

Question 112: Which chemotherapy spill response item is essential and must be readily available in HD compounding areas?

A chemotherapy spill kit with appropriate PPE and absorbents (Correct answer)
A fire extinguisher only
Only a regular trash bag
A box of standard surgical masks alone

Correct answer: A chemotherapy spill kit with appropriate PPE and absorbents

A dedicated chemotherapy spill kit with PPE, absorbent materials, and disposal bags must be available wherever HDs are handled.

Question 113: When a TPN (total parenteral nutrition) admixture is compounded, why are calcium and phosphate added with caution?

They cause the bag to expand
They can form an insoluble calcium phosphate precipitate (Correct answer)
They neutralize all amino acids
They increase glucose content excessively

Correct answer: They can form an insoluble calcium phosphate precipitate

Calcium and phosphate can combine to form insoluble calcium phosphate crystals, a serious incompatibility in TPN.

Question 114: Which counseling point is appropriate for a patient using a fluoroquinolone such as ciprofloxacin?

Increase sun exposure to boost effect
Take with antacids for best absorption
Report tendon pain and avoid taking with dairy or antacids near the dose (Correct answer)
It is safe in all children

Correct answer: Report tendon pain and avoid taking with dairy or antacids near the dose

Fluoroquinolones carry a tendon rupture risk and chelate with cations that reduce absorption.

Question 115: A patient with COPD has 3 exacerbations in the past year despite a LABA/LAMA combination. What is the best step in the treatment plan?

Add an inhaled corticosteroid (Correct answer)
Switch to a short-acting beta-agonist only
Discontinue the LAMA
Start chronic oral prednisone

Correct answer: Add an inhaled corticosteroid

Frequent exacerbations on dual bronchodilator therapy support escalation to triple therapy by adding an inhaled corticosteroid.

Question 116: Which immunization is recommended for an unvaccinated adult traveling to an area with endemic hepatitis A?

MMR booster
Tdap only
Hepatitis A vaccine (Correct answer)
Zoster vaccine

Correct answer: Hepatitis A vaccine

Hepatitis A vaccine is recommended for travelers to endemic regions.

Question 117: A patient prescribed an albuterol rescue inhaler should be counseled that it is used for what?

Treating bacterial pneumonia
Quick relief of acute bronchospasm symptoms (Correct answer)
Daily long-term control regardless of symptoms
Prevention of all asthma at night only

Correct answer: Quick relief of acute bronchospasm symptoms

Albuterol is a short-acting beta-agonist used for rapid symptom relief.

Question 118: A patient with stage G3 CKD and persistent albuminuria despite a maximized ACE inhibitor would benefit from adding which agent for renal protection?

A potassium-sparing diuretic for the proteinuria
An NSAID
A second RAAS agent (ARB)
A SGLT2 inhibitor (Correct answer)

Correct answer: A SGLT2 inhibitor

SGLT2 inhibitors slow CKD progression and reduce albuminuria, and adding a second RAAS agent is discouraged.

Question 119: What is the most common local adverse effect counseled for after intramuscular vaccination?

Seizures
Permanent paralysis
Injection site soreness (Correct answer)
Anaphylaxis

Correct answer: Injection site soreness

Injection site soreness is the most common and expected local adverse effect.

Question 120: A patient's creatinine clearance is calculated to be 45 mL/min. The standard dose of Drug X is 500 mg every 12 hours for patients with a CrCl > 60 mL/min. The dosing guidelines recommend a 50% dose reduction for patients with a CrCl between 30-60 mL/min. What is the appropriate adjusted daily dose for this patient?

1000 mg
250 mg
500 mg (Correct answer)
750 mg

Correct answer: 500 mg

The standard total daily dose is 500 mg/dose * 2 doses/day = 1000 mg/day. The patient's CrCl of 45 mL/min falls into the 30-60 mL/min range, which requires a 50% dose reduction. The adjusted daily dose is 1000 mg * 0.50 = 500 mg/day.

Question 121: A patient with newly diagnosed HIV is to start an integrase inhibitor regimen. Which baseline test guides whether abacavir can be safely used?

TSH level
G6PD activity
HLA-B*5701 testing (Correct answer)
Serum ferritin

Correct answer: HLA-B*5701 testing

Abacavir hypersensitivity is strongly associated with HLA-B*5701, so screening is required before use.

Question 122: Under USP <797>, what is the ISO class requirement for the primary engineering control (PEC) where sterile compounding is performed?

ISO Class 7
ISO Class 8
ISO Class 5 (Correct answer)
ISO Class 9

Correct answer: ISO Class 5

The direct compounding area within the PEC must maintain ISO Class 5 air quality.

Question 123: What percentage of lidocaine and hydrocortisone do you get when you mix 30 gm of 5% lidocaine cream with 90 gm of 0.5 percent hydrocortisone cream?

Lidocaine/Hydrocortisone 1.25% /0.375% (Correct answer)
Lidocaine/Hydrocortisone 2%/1.25%
Lidocaine/Hydrocortisone 2% /0.25%
Lidocaine/Hydrocortisone 0.375%/0.15%

Correct answer: Lidocaine/Hydrocortisone 1.25% /0.375%

To calculate the final percentages, first find the total weight of the mixture (30g + 90g = 120g). Then, calculate the amount of each active ingredient: 30g of 5% lidocaine contains 1.5g lidocaine (30 * 0.05), and 90g of 0.5% hydrocortisone contains 0.45g hydrocortisone (90 * 0.005). Finally, divide each amount by the total mixture weight and multiply by 100% to get the new concentrations: (1.5g lidocaine / 120g) * 100% = 1.25% lidocaine, and (0.45g hydrocortisone / 120g) * 100% = 0.375% hydrocortisone.

Question 124: Statins lower LDL primarily by:

Blocking intestinal cholesterol absorption
Binding bile acids in the intestine
Inhibiting PCSK9
Inhibiting HMG-CoA reductase and upregulating LDL receptors (Correct answer)

Correct answer: Inhibiting HMG-CoA reductase and upregulating LDL receptors

Statins inhibit HMG-CoA reductase, lowering intracellular cholesterol and upregulating hepatic LDL receptors.

Question 125: What is the milliequivalents per milliliter (mEq/ml) of 50 percent Magnesium Sulfate? (MgSO4 has a molecular weight of 120.4g/mol.)

4.11mEq/ml (Correct answer)
2.06mEq/ml
62mEq/ml
50mEq/ml

Correct answer: 4.11mEq/ml

The term '50 percent Magnesium Sulfate' in pharmaceutical contexts typically refers to a solution containing 50 grams of Magnesium Sulfate heptahydrate (MgSO4·7H2O) per 100 mL. With a molecular weight of 246.4 g/mol for MgSO4·7H2O and a valence of 2, the equivalent weight is 123.2 g/Eq. Therefore, 0.5 g/mL divided by 0.1232 g/mEq yields approximately 4.06 mEq/mL, which is closest to 4.11 mEq/mL.

Question 126: Which empiric antibiotic regimen is most appropriate for an otherwise healthy adult outpatient with community-acquired pneumonia and no comorbidities or recent antibiotics?

IV ceftriaxone plus azithromycin
Amoxicillin or doxycycline (Correct answer)
Ciprofloxacin alone
Vancomycin plus cefepime

Correct answer: Amoxicillin or doxycycline

Healthy outpatients with CAP and no comorbidities can be treated with amoxicillin or doxycycline monotherapy.

Question 127: A 58-year-old male with newly diagnosed type 2 diabetes mellitus is started on metformin. Which of the following best describes the primary mechanism by which metformin exerts its antihyperglycemic effect?

It acts as a secretagogue, stimulating insulin release from pancreatic beta cells.
Activation of AMP-activated protein kinase (AMPK), leading to decreased hepatic gluconeogenesis. (Correct answer)
It acts as a sodium-glucose cotransporter-2 (SGLT2) inhibitor in the proximal renal tubules.
It inhibits the dipeptidyl peptidase-4 (DPP-4) enzyme, increasing incretin levels.

Correct answer: Activation of AMP-activated protein kinase (AMPK), leading to decreased hepatic gluconeogenesis.

Metformin's principal effect is to decrease hepatic glucose production (gluconeogenesis). It achieves this primarily by activating the enzyme AMP-activated protein kinase (AMPK) in the liver. It also increases insulin sensitivity in peripheral tissues and decreases intestinal glucose absorption, but the reduction of hepatic gluconeogenesis is its main mechanism.

Question 128: ACE inhibitors cause cough primarily due to accumulation of:

Renin
Aldosterone
Bradykinin (Correct answer)
Angiotensin II

Correct answer: Bradykinin

ACE also degrades bradykinin; its buildup triggers the characteristic dry cough.

Question 129: What is the primary purpose of a low-lint, sterile wipe when cleaning the PEC?

Sterilize the HEPA filter
Increase humidity in the buffer room
Add fragrance to the hood
Minimize particle and fiber shedding that could contaminate the sterile field (Correct answer)

Correct answer: Minimize particle and fiber shedding that could contaminate the sterile field

Low-lint wipes prevent fibers and particles from shedding into the ISO Class 5 environment.

Question 130: How many milliliters of a 50% dextrose stock solution are needed to prepare 1,000 mL of a 10% dextrose solution?

500 mL
50 mL
200 mL (Correct answer)
100 mL

Correct answer: 200 mL

Using C1V1 = C2V2: (50%)(V1) = (10%)(1000 mL), so V1 = 200 mL.

Question 131: A patient prescribed an oral suspension antibiotic that requires refrigeration should be counseled to do what?

Freeze the suspension between doses
Discard it the day it is opened
Shake well before each dose and refrigerate as directed (Correct answer)
Store at room temperature indefinitely

Correct answer: Shake well before each dose and refrigerate as directed

Reconstituted suspensions often need refrigeration and shaking to ensure an even, accurate dose.

Question 132: A type 2 diabetic with an A1c of 9.2% on metformin alone and a history of heart failure should add which agent for best cardiovascular benefit?

Glipizide
Empagliflozin (Correct answer)
Pioglitazone
Sitagliptin

Correct answer: Empagliflozin

SGLT2 inhibitors like empagliflozin reduce heart failure hospitalizations and are preferred in diabetics with HF.

Question 133: Which adult vaccine is recommended for all adults aged 50 and older to prevent shingles?

Live attenuated zoster vaccine only
MMR
Recombinant zoster vaccine (Shingrix) (Correct answer)
Tdap

Correct answer: Recombinant zoster vaccine (Shingrix)

Recombinant zoster vaccine (Shingrix) is recommended as a two-dose series for adults 50 and older.

Question 134: A patient stabilized on warfarin begins amiodarone therapy for atrial fibrillation. What dose adjustment to warfarin is typically required?

Discontinue warfarin immediately
Increase warfarin dose by 50%
No dose adjustment is needed
Decrease warfarin dose by 30–50% (Correct answer)

Correct answer: Decrease warfarin dose by 30–50%

Amiodarone inhibits CYP2C9, the primary enzyme responsible for metabolizing warfarin's active S-enantiomer, resulting in elevated INR and requiring a 30–50% reduction in warfarin dose.

Question 135: A 45-year-old patient is initiated on lithium for the management of bipolar disorder. Which of the following sets of baseline laboratory tests is essential to obtain before starting therapy?

Liver function tests, lipid panel, and hemoglobin A1c.
Chest X-ray, electrocardiogram (ECG), and serum magnesium.
Uric acid, serum iron, and vitamin B12 levels.
Serum creatinine (renal function), thyroid stimulating hormone (TSH), complete blood count (CBC), and a pregnancy test. (Correct answer)

Correct answer: Serum creatinine (renal function), thyroid stimulating hormone (TSH), complete blood count (CBC), and a pregnancy test.

Before initiating lithium, it is crucial to assess baseline renal and thyroid function, as lithium is cleared by the kidneys and can cause hypothyroidism. Therefore, a serum creatinine and TSH are required. A complete blood count is also recommended. For females of childbearing age, a pregnancy test is necessary due to teratogenic risks. While an ECG may be considered in older patients or those with cardiovascular risk, the tests in the correct answer are considered standard for all patients.

Question 136: Which monitoring is essential when a patient begins long-term oral corticosteroid therapy?

Serum amylase only
Blood glucose and bone density (Correct answer)
Coagulation panel daily
Visual acuity weekly

Correct answer: Blood glucose and bone density

Chronic corticosteroids cause hyperglycemia and osteoporosis, so glucose and bone health are monitored.

Question 137: Which class blocks angiotensin II at the AT1 receptor without raising bradykinin?

ARBs such as losartan (Correct answer)
Direct renin inhibitors such as aliskiren
ACE inhibitors such as lisinopril
Aldosterone antagonists such as spironolactone

Correct answer: ARBs such as losartan

ARBs block AT1 receptors directly, so they cause less cough than ACE inhibitors.

Question 138: Under USP <800>, what type of facility ventilation is required for compounding hazardous drugs?

Recirculating HEPA with no pressure differential
Externally vented, negative-pressure room with at least 12 air changes per hour (Correct answer)
Positive-pressure room with no external venting
Open laboratory with general HVAC only

Correct answer: Externally vented, negative-pressure room with at least 12 air changes per hour

USP <800> requires HD compounding rooms to be externally vented, negative pressure, with a minimum of 12 ACPH.

Question 139: Which opioid is also an NMDA receptor antagonist, useful in neuropathic pain?

Hydromorphone
Morphine
Codeine
Methadone (Correct answer)

Correct answer: Methadone

Methadone provides mu-opioid agonism plus NMDA antagonism.

Question 140: Which of the following medications has the potential to raise LDL?

Metoprolol
Hydrochlorothiazide (Correct answer)
Amlodipine
Lisinopril

Correct answer: Hydrochlorothiazide

Thiazide diuretics, such as hydrochlorothiazide, are known to have several metabolic side effects, including the potential to increase LDL cholesterol and triglyceride levels. While these effects are generally modest and dose-dependent, they are a recognized adverse effect, particularly with higher doses. The other listed medications (metoprolol, lisinopril, amlodipine) typically do not raise LDL cholesterol.

Question 141: Which counseling point is correct for a patient prescribed alendronate for osteoporosis?

Take with calcium supplement simultaneously
Take with a full glass of water and remain upright for 30 minutes (Correct answer)
Lie down immediately after dosing
Take at bedtime with a snack

Correct answer: Take with a full glass of water and remain upright for 30 minutes

Alendronate must be taken with water on an empty stomach, staying upright to prevent esophageal irritation.

Question 142: Which mechanism underlies the action of sulfamethoxazole/trimethoprim?

Disruption of the cell membrane
Inhibition of bacterial DNA gyrase
Inhibition of the 30S ribosome
Sequential inhibition of folate synthesis pathway (Correct answer)

Correct answer: Sequential inhibition of folate synthesis pathway

Sulfamethoxazole blocks dihydropteroate synthase and trimethoprim blocks dihydrofolate reductase, sequentially inhibiting folate synthesis.

Question 143: A 55-year-old female is newly diagnosed with type 2 diabetes. Her initial A1C is 7.2%, and she has no history of atherosclerotic cardiovascular disease, heart failure, or chronic kidney disease. Which of the following is the most appropriate first-line pharmacologic agent to initiate in addition to lifestyle modifications?

Empagliflozin
Glipizide
Metformin (Correct answer)
Insulin glargine

Correct answer: Metformin

For most patients with newly diagnosed type 2 diabetes, metformin is the recommended first-line agent, along with comprehensive lifestyle changes. Metformin is effective, has a low risk of hypoglycemia, can promote modest weight loss, and is affordable. Sulfonylureas like glipizide carry a higher risk of hypoglycemia. SGLT2 inhibitors like empagliflozin or basal insulin are typically considered after metformin or as initial therapy in patients with very high A1C or specific comorbidities, which this patient does not have.

Question 144: Which counseling point is most important for a patient starting digoxin?

Ignore nausea and visual changes
Take extra doses if heart feels slow
Avoid all potassium-containing foods
Report nausea, vomiting, or visual disturbances as possible toxicity (Correct answer)

Correct answer: Report nausea, vomiting, or visual disturbances as possible toxicity

Nausea, vomiting, and yellow-green vision changes can signal digoxin toxicity.

Question 145: Co-administration of valproic acid with lamotrigine results in which clinically important pharmacokinetic interaction?

Valproic acid induces lamotrigine glucuronidation, halving its levels
Lamotrigine induces valproic acid metabolism, reducing its efficacy
Valproic acid inhibits UGT-mediated lamotrigine glucuronidation, approximately doubling its half-life (Correct answer)
Both drugs mutually induce each other's elimination

Correct answer: Valproic acid inhibits UGT-mediated lamotrigine glucuronidation, approximately doubling its half-life

Valproic acid inhibits UDP-glucuronosyltransferase (UGT1A4/2B7), the enzymes responsible for lamotrigine conjugation; this doubles lamotrigine's half-life and plasma levels, necessitating a 50% lamotrigine dose reduction to avoid toxicity.

Question 146: Which monitoring parameter is most important for a patient starting amiodarone long term?

Folate level
Uric acid
Thyroid and pulmonary function (Correct answer)
Serum amylase

Correct answer: Thyroid and pulmonary function

Amiodarone can cause thyroid dysfunction and pulmonary fibrosis, requiring baseline and periodic monitoring.

Question 147: What is the primary purpose of the Vaccine Adverse Event Reporting System (VAERS)?

To approve new vaccines
To manufacture vaccines
To monitor post-marketing safety signals of vaccines (Correct answer)
To set vaccine prices

Correct answer: To monitor post-marketing safety signals of vaccines

VAERS is a national passive surveillance system used to detect potential vaccine safety signals after licensure.

Question 148: A physician orders an IV infusion of dopamine at 7 mcg/kg/min for a patient weighing 187 lbs. The pharmacy provides a dopamine drip of 400 mg in 250 mL of D5W. At what rate, in mL/hr, should the infusion pump be set?

15.1 mL/hr
45.2 mL/hr
33.8 mL/hr
22.6 mL/hr (Correct answer)

Correct answer: 22.6 mL/hr

First, convert the patient's weight from pounds to kilograms: 187 lbs / 2.2 lbs/kg = 85 kg. Next, calculate the total dose in mcg per minute: 85 kg * 7 mcg/kg/min = 595 mcg/min. Then, convert the dose from mcg/min to mg/hr: 595 mcg/min * 60 min/hr / 1000 mcg/mg = 35.7 mg/hr. Now, determine the concentration of the dopamine solution: 400 mg / 250 mL = 1.6 mg/mL. Finally, calculate the infusion rate in mL/hr: 35.7 mg/hr / 1.6 mg/mL = 22.31 mL/hr, which rounds to 22.3 mL/hr. Among the choices, 22.6 mL/hr is the closest answer.

Question 149: During a prospective drug utilization review (DUR), a pharmacist notes a prescription for rosuvastatin for a patient currently taking gemfibrozil. Which of the following drug therapy problems should the pharmacist identify?

Unnecessary drug therapy
Therapeutic duplication
A significant drug-drug interaction increasing the risk of myopathy (Correct answer)
A dose that is too low to be effective

Correct answer: A significant drug-drug interaction increasing the risk of myopathy

The concurrent use of gemfibrozil with statins, particularly rosuvastatin, significantly increases the risk of severe myopathy and rhabdomyolysis. Gemfibrozil inhibits the metabolism of statins, leading to higher systemic concentrations. This combination is generally contraindicated or requires extreme caution with very low statin doses and close monitoring. This represents a critical safety issue that must be addressed before dispensing.

Question 150: A patient stabilized on warfarin for atrial fibrillation (target INR 2.0-3.0) is prescribed a new medication. Two weeks later, their INR is 1.3. Which of the following newly prescribed medications is the most likely cause of this subtherapeutic INR?

Amiodarone
Carbamazepine (Correct answer)
Fluconazole
Metronidazole

Correct answer: Carbamazepine

Carbamazepine is a potent inducer of CYP2C9, the primary enzyme responsible for metabolizing the more potent S-enantiomer of warfarin. Induction of this enzyme leads to increased metabolism of warfarin, a lower serum concentration, and a subtherapeutic INR, increasing the risk of thromboembolism. Amiodarone, metronidazole, and fluconazole are all well-known inhibitors of CYP2C9 and would be expected to increase the INR.

Question 151: Which is the most important counseling point for a patient using insulin glargine?

It works within 5 minutes
It is long-acting and should not be mixed with other insulins in the same syringe (Correct answer)
It is a rapid-acting insulin taken with meals
Shake the vial vigorously before use

Correct answer: It is long-acting and should not be mixed with other insulins in the same syringe

Glargine is a long-acting basal insulin that should not be mixed with other insulins.

Question 152: What is the minimum percentage of active ingredient recovery typically required for an acceptable compounded preparation?

80–125% of labeled potency
50–150% of labeled potency
90–110% of labeled potency (Correct answer)
70–130% of labeled potency

Correct answer: 90–110% of labeled potency

Compounded preparations generally must contain 90–110% of the labeled amount of active ingredient.

Question 153: A pharmacist is counseling a patient who is starting dabigatran (Pradaxa) for the first time. Which of the following instructions is most critical for maintaining the medication's stability and effectiveness?

"You can crush the capsules and mix them with applesauce if they are hard to swallow."
"It is okay to skip a dose occasionally if you are not having any symptoms."
"Take this medication with a high-fat meal to increase its absorption."
"Keep the capsules in the original manufacturer's bottle and do not transfer them to a pill organizer." (Correct answer)

Correct answer: "Keep the capsules in the original manufacturer's bottle and do not transfer them to a pill organizer."

Dabigatran capsules are highly sensitive to moisture and must be dispensed and stored in their original container, which contains a desiccant cap, or in a blister pack. Transferring the capsules to a pill organizer or another container can expose them to humidity, leading to degradation and loss of potency. The other counseling points are incorrect and potentially dangerous.

Question 154: Which statin requires the most caution when combined with gemfibrozil due to rhabdomyolysis risk?

Pravastatin
Rosuvastatin
Atorvastatin
Simvastatin (Correct answer)

Correct answer: Simvastatin

Gemfibrozil is contraindicated with simvastatin because it greatly increases statin exposure and myopathy risk.

Question 155: A patient starting isotretinoin must be counseled about which critical requirement?

Take with high-fat alcohol
Stop sunscreen use
No need for any pregnancy precautions
Strict pregnancy prevention due to teratogenicity (iPLEDGE) (Correct answer)

Correct answer: Strict pregnancy prevention due to teratogenicity (iPLEDGE)

Isotretinoin is highly teratogenic and requires the iPLEDGE program with strict contraception.

Question 156: DPP-4 inhibitors such as sitagliptin lower glucose by:

Blocking renal glucose reabsorption
Inhibiting hepatic gluconeogenesis directly
Stimulating glucagon release
Preventing incretin (GLP-1) degradation (Correct answer)

Correct answer: Preventing incretin (GLP-1) degradation

DPP-4 inhibitors prolong incretin action, enhancing insulin secretion.

Question 157: A patient reports to the pharmacy that they developed significant joint pain and a fever of 102°F two days after receiving a routine vaccination. As a healthcare provider, the pharmacist should report this clinically significant adverse event to which national safety surveillance program?

The Vaccine Adverse Event Reporting System (VAERS) (Correct answer)
The Centers for Medicare & Medicaid Services (CMS)
The FDA MedWatch Program
The Institute for Safe Medication Practices (ISMP)

Correct answer: The Vaccine Adverse Event Reporting System (VAERS)

The Vaccine Adverse Event Reporting System (VAERS) is a national post-marketing safety surveillance program co-managed by the CDC and FDA. Healthcare professionals are encouraged to report any clinically significant adverse events following vaccination to VAERS, even if they are unsure if the vaccine caused the event. This system helps detect new, unusual, or rare adverse events. MedWatch is for drugs and other medical products, while ISMP focuses on medication errors.

Question 158: A patient with gout has 3 attacks per year and a serum urate of 9 mg/dL. After acute treatment, what is the appropriate long-term plan?

Start probenecid in a patient with nephrolithiasis
Use colchicine only during attacks indefinitely
Avoid all urate-lowering therapy
Start allopurinol with a urate target below 6 mg/dL (Correct answer)

Correct answer: Start allopurinol with a urate target below 6 mg/dL

Recurrent gout with elevated urate warrants urate-lowering therapy such as allopurinol titrated to a target below 6 mg/dL.

Question 159: Which drug's toxicity is treated with N-acetylcysteine?

Digoxin
Acetaminophen (Correct answer)
Aspirin
Heparin

Correct answer: Acetaminophen

N-acetylcysteine replenishes glutathione to detoxify acetaminophen's NAPQI metabolite.

Question 160: Which route is used to administer the varicella vaccine?

Subcutaneous (Correct answer)
Intramuscular
Intranasal
Oral

Correct answer: Subcutaneous

Varicella vaccine is administered subcutaneously.

Question 161: Which drug interaction increases risk of serotonin syndrome?

SSRI plus MAO inhibitor (Correct answer)
Warfarin plus vitamin K
Metformin plus sulfonylurea
ACE inhibitor plus thiazide

Correct answer: SSRI plus MAO inhibitor

Combining serotonergic agents like SSRIs with MAOIs can cause serotonin syndrome.

Question 162: You are asked to compound 240 mL of a 1:500 (w/v) solution. The drug is available as a pure powder. How many milligrams of the drug powder are needed?

480 mg (Correct answer)
120 mg
240 mg
500 mg

Correct answer: 480 mg

A 1:500 w/v solution means there is 1 gram of solute in every 500 mL of solution. To find out how much drug is needed for 240 mL, a proportion can be set up: (1 g / 500 mL) = (x g / 240 mL). Solving for x gives: x = (1 * 240) / 500 = 0.48 g. To convert grams to milligrams, multiply by 1000: 0.48 g * 1000 mg/g = 480 mg.

Question 163: A patient started on a statin develops unexplained muscle pain with a markedly elevated creatine kinase. What is the appropriate action?

Continue the statin and recheck in 6 months
Add a fibrate to the statin
Increase the statin dose
Discontinue the statin immediately (Correct answer)

Correct answer: Discontinue the statin immediately

Marked CK elevation with myalgia suggests statin-induced myopathy, requiring prompt discontinuation of the statin.

Question 164: Which counseling statement is correct for a patient taking sublingual or oral spironolactone?

Avoid potassium supplements and high-potassium salt substitutes (Correct answer)
Take double doses if you miss one
It causes severe potassium loss
Use salt substitutes liberally

Correct answer: Avoid potassium supplements and high-potassium salt substitutes

Spironolactone is potassium-sparing, so added potassium can cause hyperkalemia.

Question 165: What is the appropriate hand antiseptic step immediately before donning sterile gloves in the anteroom?

Rinse with tap water only
Wipe hands with a dry paper towel
Apply petroleum-based lotion
Apply a waterless alcohol-based surgical hand scrub and let dry (Correct answer)

Correct answer: Apply a waterless alcohol-based surgical hand scrub and let dry

After gowning, a persistent alcohol-based surgical hand antiseptic is applied and allowed to dry before donning sterile gloves.

Question 166: A pharmacy is implementing a new policy for high-alert medications based on Institute for Safe Medication Practices (ISMP) recommendations. Which of the following best describes the procedure for a proper independent double check?

One staff member prepares the medication while a second staff member watches and confirms the steps.
The pharmacist and technician perform the check together at the same time to reach a consensus.
The same staff member prepares the medication and then re-checks their own work after a 15-minute delay.
Two staff members individually and separately perform the check (e.g., calculation, verification) and then compare their results. (Correct answer)

Correct answer: Two staff members individually and separately perform the check (e.g., calculation, verification) and then compare their results.

An independent double check requires two practitioners to separately and independently check the work process. Each person conducts the check alone and apart from the other, and then they compare their results. This method prevents one person's potential error or bias from influencing the other, making it more effective at catching mistakes than checking together or having one person watch another.

Question 167: Which monitoring parameter is most important to establish at baseline before starting amiodarone for chronic atrial fibrillation?

Serum potassium only
Bone density scan
Thyroid, liver, and pulmonary function tests (Correct answer)
Fasting lipid panel

Correct answer: Thyroid, liver, and pulmonary function tests

Amiodarone can cause thyroid, hepatic, and pulmonary toxicity, so baseline TFTs, LFTs, and pulmonary function are required.

Question 168: While reviewing a patient's profile, a pharmacist notices that a 45-year-old male with hypertension has been refilling his lisinopril prescription every 40-45 days, despite it being a 30-day supply. What is the most appropriate initial action for the pharmacist to take?

Inform the patient that his blood pressure will not be controlled if he continues this pattern.
Call the prescriber to report the patient's non-adherence.
Refuse to refill the prescription until the patient explains the delay.
Ask the patient in a non-judgmental, open-ended way, "I noticed it's been a little while since your last refill, how have you been taking your medication?" (Correct answer)

Correct answer: Ask the patient in a non-judgmental, open-ended way, "I noticed it's been a little while since your last refill, how have you been taking your medication?"

The best initial approach to suspected non-adherence is to use open-ended, non-judgmental communication to gather information. Asking an exploratory question like this opens a dialogue, allowing the patient to share potential barriers (e.g., side effects, cost, forgetfulness) without feeling accused. Calling the prescriber or making a threatening statement is premature and can damage the pharmacist-patient relationship. Refusing the refill is inappropriate and punitive.

Question 169: Which antibiotic is contraindicated with tizanidine due to inhibition of CYP1A2, causing potentially dangerous elevations in tizanidine levels?

Ciprofloxacin (Correct answer)
Azithromycin
Amoxicillin
Clindamycin

Correct answer: Ciprofloxacin

Ciprofloxacin is a potent CYP1A2 inhibitor; since tizanidine is primarily metabolized by CYP1A2, this combination can cause a 10-fold increase in tizanidine exposure, leading to profound hypotension and sedation.

Question 170: Which antibiotic class inhibits bacterial DNA gyrase and topoisomerase IV?

Tetracyclines
Aminoglycosides
Macrolides
Fluoroquinolones (Correct answer)

Correct answer: Fluoroquinolones

Fluoroquinolones target DNA gyrase and topoisomerase IV, blocking DNA replication.

Question 171: A patient is to receive an IV infusion of 0.9% NaCl with 20 mEq of KCl over 8 hours. The total volume of the IV bag is 1000 mL. The IV administration set delivers 15 gtt/mL. What is the correct flow rate in drops per minute (gtt/min)?

21 gtt/min
31 gtt/min (Correct answer)
125 gtt/min
15 gtt/min

Correct answer: 31 gtt/min

First, calculate the flow rate in mL/hr: 1000 mL / 8 hours = 125 mL/hr. Next, convert mL/hr to mL/min: 125 mL / 60 min = 2.083 mL/min. Finally, use the administration set's drop factor to find the rate in gtt/min: 2.083 mL/min * 15 gtt/mL = 31.25 gtt/min. Rounding to the nearest whole number gives 31 gtt/min.

Question 172: What is the antidote for benzodiazepine overdose?

Naloxone
Atropine
Pralidoxime
Flumazenil (Correct answer)

Correct answer: Flumazenil

Flumazenil is a competitive benzodiazepine receptor antagonist used cautiously in overdose.

Question 173: Which anticoagulant directly inhibits factor Xa?

Heparin (unfractionated)
Argatroban
Warfarin
Rivaroxaban (Correct answer)

Correct answer: Rivaroxaban

Rivaroxaban is a direct oral factor Xa inhibitor.

Question 174: A patient is brought to the emergency department with respiratory depression and miosis. An opioid overdose is suspected. Administration of naloxone rapidly reverses these symptoms. By what mechanism does naloxone work?

It increases the metabolic clearance of opioids by inducing hepatic enzymes.
It acts as a partial agonist at the mu-opioid receptor, displacing the full agonist.
It acts as a competitive antagonist at mu, kappa, and delta opioid receptors. (Correct answer)
It stimulates the release of endogenous endorphins to counteract the opioid effect.

Correct answer: It acts as a competitive antagonist at mu, kappa, and delta opioid receptors.

Naloxone is a pure opioid antagonist that has a high affinity for opioid receptors, particularly the mu-receptor. It works by competitively binding to these receptors, thereby displacing the opioid agonist (like heroin or oxycodone) and rapidly reversing its effects, most critically respiratory depression.

Question 175: Under USP <800>, gloves used when handling hazardous drugs should meet which standard?

ASTM D6978 chemotherapy-tested gloves (Correct answer)
Latex gloves of any thickness
Reusable cloth gloves
Standard non-sterile exam gloves only

Correct answer: ASTM D6978 chemotherapy-tested gloves

HD handling requires chemotherapy gloves tested per ASTM D6978 for permeation resistance.

Question 176: Which counseling point is appropriate for a patient prescribed nitroglycerin sublingual tablets for angina?

Swallow the tablet whole with water
Take three tablets at once at first symptom
Store tablets in a weekly pill organizer
Place under the tongue and call 911 if pain persists after the first dose (Correct answer)

Correct answer: Place under the tongue and call 911 if pain persists after the first dose

Current guidance is to take one dose and call emergency services if chest pain is not relieved.

Question 177: A patient on warfarin starts amiodarone; what is the expected interaction?

Decreased warfarin absorption
Decreased INR from enzyme induction
No interaction
Increased INR from CYP2C9/CYP3A4 inhibition (Correct answer)

Correct answer: Increased INR from CYP2C9/CYP3A4 inhibition

Amiodarone inhibits CYP2C9 and CYP3A4, raising warfarin levels and INR.

Question 178: Per USP <800>, where should hazardous drugs be unpacked?

In any convenient positive-pressure office
In a neutral or negative-pressure area, never in a positive-pressure space (Correct answer)
Only inside the laminar airflow hood
In the pharmacy waiting room

Correct answer: In a neutral or negative-pressure area, never in a positive-pressure space

HDs must be unpacked in a neutral/negative-pressure area to prevent contamination spread, not in positive-pressure rooms.

Question 179: A patient using a metered-dose inhaler with an inhaled corticosteroid should be counseled to do what after each use?

Swallow extra water with the medication
Hold breath for 1 second only
Rinse the mouth and spit to prevent oral thrush (Correct answer)
Use the inhaler only when symptoms occur

Correct answer: Rinse the mouth and spit to prevent oral thrush

Rinsing the mouth after an inhaled corticosteroid reduces the risk of oral candidiasis.

Question 180: To create 1/3 NS 1 liter bag, you'll need 51.3 mEq of NaCl. How much 23.4 percent NaCl would you require? (Na has a molecular weight of 23 while Cl has a molecular weight of 35.5)

58.5ml
23.4ml
10ml
12.82ml (Correct answer)

Correct answer: 12.82ml

To determine the volume of 23.4% NaCl needed, first calculate the total grams of NaCl required: 51.3 mEq of NaCl is equivalent to 51.3 mmol, and with a molecular weight of 58.5 g/mol (23+35.5), this is 2.99955 grams. Since 23.4% NaCl means 23.4 grams of NaCl per 100 mL of solution, you would need (2.99955 g / 23.4 g) * 100 mL, which equals approximately 12.82 mL.

Question 181: A patient taking high-dose corticosteroids (20 mg prednisone daily for 3 weeks) should avoid which vaccine?

Inactivated influenza vaccine
Hepatitis A vaccine
MMR (Correct answer)
Pneumococcal conjugate vaccine

Correct answer: MMR

Live vaccines like MMR are contraindicated in patients on high-dose immunosuppressive corticosteroid therapy.

Question 182: A patient on phenazopyridine for urinary discomfort should be told to expect what?

Reddish-orange discoloration of urine (Correct answer)
Loss of taste
Permanent kidney damage
Blue-green stools

Correct answer: Reddish-orange discoloration of urine

Phenazopyridine harmlessly stains urine an orange-red color.

Question 183: A patient on an SSRI should be counseled that full therapeutic effect typically occurs after how long?

After 4 to 6 weeks (Correct answer)
Within 1 day
Within a few hours
Only after 6 months

Correct answer: After 4 to 6 weeks

Antidepressant effects of SSRIs generally take several weeks to develop fully.

Question 184: A nurse in an emergency department needs to urgently prepare a single dose of an IV medication for a patient. The process involves a simple transfer from a sterile vial to a syringe. The drug is not hazardous, involves no more than three sterile products, and administration will begin within four hours. Under which USP <797> classification can this preparation be compounded outside of an ISO Class 5 environment?

Immediate-Use CSP (Correct answer)
High-Risk CSP
Low-Risk CSP
Medium-Risk CSP

Correct answer: Immediate-Use CSP

This scenario meets the criteria for an Immediate-Use Compounded Sterile Preparation (CSP). According to USP <797>, immediate-use CSPs are exempt from the requirements for Category 1, 2, or 3 CSPs (and the older low/medium/high risk levels) if they are intended for emergency or immediate patient administration, involve no more than three sterile products, and administration begins within four hours of the start of preparation. Low, Medium, and High-Risk CSPs require preparation within an ISO Class 5 PEC.

Question 185: A pharmacist needs to incorporate a very small amount of a potent powdered drug into a large amount of diluent to prepare a capsule formulation. Which of the following compounding techniques is most appropriate to ensure a homogenous mixture?

Pulverization by intervention
Spatulation
Geometric dilution (Correct answer)
Levigation

Correct answer: Geometric dilution

Geometric dilution is the standard method for blending two or more powder ingredients of unequal quantities to ensure the final mixture is uniform. It involves starting with the smallest quantity ingredient and mixing it with an approximately equal amount of the larger quantity ingredient, then continuing to add the diluent in amounts equal to the mixture's volume until all the diluent is incorporated.

Question 186: Which intervention is appropriate first-line treatment for vaccine-induced anaphylaxis?

Intramuscular epinephrine (Correct answer)
Oral antihistamine alone
Observation only
Oral corticosteroid alone

Correct answer: Intramuscular epinephrine

Intramuscular epinephrine is the first-line treatment for anaphylaxis following vaccination.

Question 187: Which mechanism underlies the bronchodilation produced by albuterol?

Leukotriene receptor blockade
Muscarinic receptor antagonism
Phosphodiesterase inhibition
Beta-2 adrenergic receptor agonism increasing cAMP (Correct answer)

Correct answer: Beta-2 adrenergic receptor agonism increasing cAMP

Albuterol stimulates beta-2 receptors, raising cAMP and relaxing airway smooth muscle.

Question 188: A patient with stage 4 CKD (eGFR 22) and atrial fibrillation needs anticoagulation. Which agent requires the most caution or avoidance?

Warfarin with INR monitoring
Apixaban with dose adjustment
Reduced-dose apixaban
Dabigatran standard dose (Correct answer)

Correct answer: Dabigatran standard dose

Dabigatran is heavily renally cleared and standard dosing is inappropriate in severe CKD.

Question 189: When a patient is taking an SGLT2 inhibitor, which of the following should be monitored?

All of the above (Correct answer)
Hydration status
Blood pressure
Blood glucose

Correct answer: All of the above

SGLT2 inhibitors increase glucose excretion in the urine, which can lead to several physiological changes requiring comprehensive monitoring. Blood glucose must be monitored for efficacy, blood pressure should be checked due to their diuretic effect, and hydration status is crucial to prevent dehydration and acute kidney injury. Therefore, monitoring all these parameters is essential for patient safety and optimal management.

Question 190: Why must aminoglycosides be dosed carefully with monitoring?

They cause QT prolongation primarily
Narrow therapeutic index with nephro- and ototoxicity (Correct answer)
They are highly protein bound
They are CYP3A4 inducers

Correct answer: Narrow therapeutic index with nephro- and ototoxicity

Aminoglycosides have a narrow therapeutic index, risking nephrotoxicity and ototoxicity.

Question 191: A patient using a new insulin pen should be counseled to do what before injecting a dose?

Reuse the same needle for a week
Prime the pen to remove air and confirm flow (Correct answer)
Inject into the same exact spot daily
Inject into a muscle for faster action

Correct answer: Prime the pen to remove air and confirm flow

Priming clears air and ensures accurate dose delivery from the pen.

Question 192: What does a closed-system transfer device (CSTD) accomplish when handling hazardous drugs?

Increases the drug concentration
Mechanically prohibits transfer of environmental contaminants in and escape of drug or vapor out (Correct answer)
Replaces the need for a biological safety cabinet
Sterilizes the hazardous drug

Correct answer: Mechanically prohibits transfer of environmental contaminants in and escape of drug or vapor out

A CSTD prevents drug or vapor escape and blocks environmental contaminant entry during HD transfer.

Question 193: Which of the following represents the correct calculation for the osmolarity (mOsmol/L) of a 3% hypertonic saline (NaCl) solution? (MW of Na = 23, MW of Cl = 35.5)

(30 g/L / 94.5 g/mol) * 2 * 1000
(30 g/L / 58.5 g/mol) * 1 * 1000
(3 g/L / 58.5 g/mol) * 2 * 1000
(30 g/L / 58.5 g/mol) * 2 * 1000 (Correct answer)

Correct answer: (30 g/L / 58.5 g/mol) * 2 * 1000

Osmolarity (mOsmol/L) = (Concentration in g/L / MW in g/mol) * number of species * 1000. A 3% solution is 3 g/100 mL, which is 30 g/L. The molecular weight (MW) of NaCl is 23 + 35.5 = 58.5 g/mol. NaCl dissociates into 2 species (Na+ and Cl-). Therefore, the correct calculation is (30 g/L / 58.5 g/mol) * 2 * 1000.

Question 194: Which of the following is a true contraindication, not merely a precaution, to a vaccine?

Mild cold with low-grade fever
History of anaphylaxis to a vaccine component (Correct answer)
Family history of adverse events
Current antibiotic use

Correct answer: History of anaphylaxis to a vaccine component

A history of anaphylaxis to a vaccine or its components is a true contraindication.

Question 195: Which mechanism explains the action of direct oral anticoagulant apixaban?

Vitamin K antagonism
Direct factor Xa inhibition (Correct answer)
Direct thrombin (factor IIa) inhibition
Antithrombin III potentiation

Correct answer: Direct factor Xa inhibition

Apixaban directly and reversibly inhibits factor Xa.

Question 196: Phenytoin exhibits which pharmacokinetic property at therapeutic doses?

First-order elimination only
No protein binding
Zero-order (nonlinear) elimination (Correct answer)
Renal elimination unchanged

Correct answer: Zero-order (nonlinear) elimination

Phenytoin shows saturable metabolism, so small dose changes cause large level swings.

Question 197: A patient starting montelukast should be counseled about which potential adverse effect?

Permanent hair loss
Bright orange urine
Neuropsychiatric effects such as mood changes (Correct answer)
Severe hyperglycemia

Correct answer: Neuropsychiatric effects such as mood changes

Montelukast carries a warning for neuropsychiatric events including mood and behavior changes.

Question 198: A 58-year-old with type 2 diabetes, eGFR 28 mL/min, and HbA1c 8.9% is on metformin. What is the most appropriate change to the treatment plan?

Continue metformin and add a sulfonylurea
Discontinue metformin and add a GLP-1 receptor agonist or insulin (Correct answer)
Increase metformin to maximum dose
Discontinue metformin and start a SGLT2 inhibitor

Correct answer: Discontinue metformin and add a GLP-1 receptor agonist or insulin

Metformin is contraindicated when eGFR is below 30 mL/min due to lactic acidosis risk, so it should be stopped and replaced with an agent safe in renal impairment.

Question 199: An order is written for 25 mEq of potassium chloride (KCl) to be added to a 1 L bag of 0.9% NaCl. The pharmacy has a stock vial of KCl 2 mEq/mL. How many milliliters of the stock solution must be added to the bag? (MW of K=39, Cl=74.5)

10 mL
12.5 mL (Correct answer)
15 mL
25 mL

Correct answer: 12.5 mL

This is a direct dosage calculation. The desired dose is 25 mEq of KCl. The available concentration is 2 mEq/mL. To find the required volume, divide the desired dose by the concentration: 25 mEq / 2 mEq/mL = 12.5 mL. The molecular weights are extra, unneeded information.

Question 200: Which is the best counseling for a patient starting oral prednisone for a tapering course?

Do not stop suddenly; follow the taper as directed (Correct answer)
Stop abruptly once you feel better
Take all doses at bedtime to aid sleep
Skip doses on weekends

Correct answer: Do not stop suddenly; follow the taper as directed

Abrupt discontinuation of corticosteroids can cause adrenal insufficiency, so tapering is required.

Question 201: Except for ____, all of the above could raise your triglycerides.

Glucocorticoids
Protease inhibitor
Oral estrogens
Fish Oil (Correct answer)

Correct answer: Fish Oil

Fish oil, particularly its omega-3 fatty acid components like EPA and DHA, is well-known for its ability to lower triglyceride levels, especially at higher doses. In contrast, oral estrogens, protease inhibitors, and glucocorticoids are all medication classes that are recognized to potentially increase triglyceride levels as a common adverse effect. Therefore, fish oil is the exception that would not raise triglycerides.

Question 202: A patient with newly diagnosed type 1 diabetes requires an insulin plan. Which regimen best mimics physiologic insulin secretion?

Sliding-scale regular insulin only
Basal-bolus with a long-acting and rapid-acting analog (Correct answer)
A single dose of long-acting insulin daily
NPH twice daily only

Correct answer: Basal-bolus with a long-acting and rapid-acting analog

A basal-bolus regimen using long-acting plus mealtime rapid-acting insulin best replicates normal insulin physiology in type 1 diabetes.

Question 203: A patient maintained on lithium for bipolar disorder begins taking ibuprofen regularly for arthritis pain. What effect on lithium levels is expected?

Lithium half-life will shorten significantly
Lithium levels will remain unchanged
Lithium levels will decrease
Lithium levels will increase (Correct answer)

Correct answer: Lithium levels will increase

NSAIDs inhibit prostaglandin-mediated renal vasodilation, reducing renal blood flow and lithium clearance, which raises serum lithium levels and increases the risk of toxicity.

Question 204: A patient with newly diagnosed stage 2 hypertension and no compelling indications has a blood pressure of 162/98 mmHg. What is the preferred initial pharmacologic approach?

An alpha-blocker monotherapy
A loop diuretic plus a beta-blocker
Single low-dose thiazide only
Two first-line agents from different classes (Correct answer)

Correct answer: Two first-line agents from different classes

Stage 2 hypertension generally warrants initiating two first-line antihypertensives of different classes to reach goal blood pressure.

Question 205: The antidote for benzodiazepine overdose is:

Naloxone
N-acetylcysteine
Flumazenil (Correct answer)
Atropine

Correct answer: Flumazenil

Flumazenil is a competitive GABA-A benzodiazepine receptor antagonist.

Question 206: A patient is prescribed alendronate 70 mg weekly. Which statement represents the most accurate and critical counseling instruction for administering this medication?

Take the tablet at bedtime with 8 ounces of plain water to ensure it is absorbed overnight.
Take the tablet first thing in the morning with at least 6 ounces of plain water, and do not lie down for at least 30 minutes. (Correct answer)
Take the tablet with a full glass of milk to prevent stomach upset and remain upright for at least 15 minutes.
Take the tablet with your breakfast and a cup of coffee to make it easier to remember.

Correct answer: Take the tablet first thing in the morning with at least 6 ounces of plain water, and do not lie down for at least 30 minutes.

Proper administration of bisphosphonates like alendronate is critical to ensure absorption and prevent severe esophageal irritation. The medication must be taken upon waking with a full glass of plain water (not coffee, juice, or milk) at least 30 minutes before any food, drink, or other medication. The patient must also remain upright (sitting or standing) for at least 30 minutes to prevent the tablet from lodging in the esophagus.

Question 207: A patient with osteoporosis and a history of esophageal stricture needs treatment. Which option best fits the treatment plan?

IV zoledronic acid annually (Correct answer)
Oral alendronate weekly
Oral ibandronate monthly
Oral risedronate daily

Correct answer: IV zoledronic acid annually

Oral bisphosphonates are contraindicated with esophageal abnormalities, so IV zoledronic acid is preferred.

Question 208: A patient with chronic kidney disease stage 4 and anemia has iron-replete stores. What is the most appropriate therapy?

An erythropoiesis-stimulating agent (Correct answer)
Folic acid alone
Oral iron supplementation alone
Vitamin B12 injection

Correct answer: An erythropoiesis-stimulating agent

Anemia of CKD with adequate iron stores is treated with an erythropoiesis-stimulating agent to correct erythropoietin deficiency.

Question 209: A patient prescribed oral iron supplements should be counseled to expect which common effect?

Severe hair growth
Dark or black stools and possible constipation (Correct answer)
Bright red urine
Permanent tooth loss

Correct answer: Dark or black stools and possible constipation

Oral iron commonly darkens the stool and may cause constipation.

Question 210: A 68-year-old with heart failure (EF 30%) and a serum potassium of 5.6 mEq/L is on lisinopril and spironolactone. Which intervention is most appropriate?

Add amlodipine for additional benefit
Increase the lisinopril dose
Start a potassium supplement
Hold the spironolactone and recheck potassium (Correct answer)

Correct answer: Hold the spironolactone and recheck potassium

Hyperkalemia (>5.5 mEq/L) from combined ACE inhibitor and aldosterone antagonist therapy warrants holding the spironolactone and rechecking potassium.

Question 211: A 72-year-old patient is starting apixaban for stroke prevention in nonvalvular atrial fibrillation. When counseling the patient, which of the following points is MOST critical to emphasize?

To seek immediate medical attention for signs of major bleeding, such as red or black tarry stools. (Correct answer)
Avoid co-administration with NSAIDs like ibuprofen without consulting a provider.
Take the medication at the same times each day to maintain consistent blood levels.
Do not stop taking the medication abruptly as this can increase the risk of stroke.

Correct answer: To seek immediate medical attention for signs of major bleeding, such as red or black tarry stools.

While all points are important for counseling on apixaban, the most critical for immediate patient safety is recognizing and acting on signs of major bleeding. A gastrointestinal bleed, indicated by red or black tarry stools, can be life-threatening and requires immediate medical intervention. The other points relate to adherence, drug interactions, and long-term risks, which are crucial but secondary to the acute danger of a major bleed.

Question 212: According to the 2017 ACC/AHA High Blood Pressure Clinical Practice Guideline, which of the following is the most appropriate first-line medication choice for a 58-year-old Black male newly diagnosed with Stage 1 hypertension and no other comorbidities?

Lisinopril
Atenolol
Hydrochlorothiazide (Correct answer)
Losartan

Correct answer: Hydrochlorothiazide

The 2017 ACC/AHA guidelines recommend either a thiazide-type diuretic or a calcium channel blocker as first-line monotherapy for hypertension in Black adults without heart failure or chronic kidney disease. ACE inhibitors (like lisinopril) and ARBs (like losartan) have been shown to be less effective in lowering blood pressure in this population when used as monotherapy. Beta-blockers like atenolol are no longer recommended as initial therapy for hypertension unless the patient has specific comorbidities like ischemic heart disease or heart failure.

Question 213: Which therapy is most appropriate first-line for a patient with a new VTE and normal renal function who prefers oral therapy without monitoring?

A direct oral anticoagulant such as rivaroxaban (Correct answer)
Aspirin alone
Warfarin with frequent INR checks
Subcutaneous heparin indefinitely

Correct answer: A direct oral anticoagulant such as rivaroxaban

DOACs are preferred first-line for VTE in patients without contraindications and require no routine monitoring.

Question 214: Which is appropriate counseling for a patient prescribed sumatriptan for migraines?

Take at the onset of a migraine; do not exceed recommended doses (Correct answer)
Combine freely with other triptans or ergots
It treats tension headaches only
Use it daily to prevent all headaches

Correct answer: Take at the onset of a migraine; do not exceed recommended doses

Triptans are used acutely at migraine onset with dosing limits to avoid serotonin and cardiovascular risks.

Question 215: A patient stabilized on an SSRI is prescribed tramadol for acute pain. Which serious adverse reaction is most likely to result from this combination?

Anticholinergic toxicity
Serotonin syndrome (Correct answer)
Neuroleptic malignant syndrome
Extrapyramidal effects

Correct answer: Serotonin syndrome

Both SSRIs and tramadol increase serotonergic activity, and their concurrent use can precipitate serotonin syndrome characterized by hyperthermia, autonomic instability, and neuromuscular abnormalities.

Question 216: An asthmatic patient using a rescue albuterol inhaler more than twice weekly indicates the need for which therapy adjustment?

Increase albuterol frequency
Add an inhaled corticosteroid (Correct answer)
Discontinue all therapy
Add an oral decongestant

Correct answer: Add an inhaled corticosteroid

Frequent rescue inhaler use signals inadequate control, requiring a controller such as an inhaled corticosteroid.

Question 217: A patient on a statin reports new muscle pain and the CK is markedly elevated. What is the priority intervention?

Discontinue the statin and assess for rhabdomyolysis (Correct answer)
Continue and reassess in 3 months
Add a fibrate immediately
Increase the statin dose

Correct answer: Discontinue the statin and assess for rhabdomyolysis

Marked CK elevation with myalgia suggests statin myopathy or rhabdomyolysis, requiring drug discontinuation.

Question 218: A 62-year-old male with a history of COPD and diabetes presents to an outpatient clinic with symptoms of community-acquired pneumonia (CAP). He has not been recently hospitalized or received IV antibiotics. According to the 2019 ATS/IDSA guidelines, which of the following is an appropriate empiric antibiotic regimen for this patient?

Ciprofloxacin 500 mg twice daily
Amoxicillin/clavulanate 875 mg/125 mg twice daily PLUS doxycycline 100 mg twice daily (Correct answer)
Amoxicillin 1 g three times daily
Azithromycin 500 mg daily

Correct answer: Amoxicillin/clavulanate 875 mg/125 mg twice daily PLUS doxycycline 100 mg twice daily

For outpatients with CAP who have comorbidities such as chronic lung disease (COPD) or diabetes, guidelines recommend combination therapy. An appropriate regimen is a beta-lactam (like amoxicillin/clavulanate) plus a macrolide or doxycycline. Monotherapy with amoxicillin is reserved for healthy patients without comorbidities. Macrolide monotherapy is not recommended in many areas due to high rates of pneumococcal resistance. Ciprofloxacin is not a respiratory fluoroquinolone and lacks reliable activity against Streptococcus pneumoniae.

Question 219: A patient with atrial fibrillation and a CHA2DS2-VASc score of 4 is currently on aspirin only. What is the appropriate therapeutic change?

Discontinue all therapy
Start oral anticoagulation (Correct answer)
Add a second antiplatelet
Continue aspirin alone

Correct answer: Start oral anticoagulation

A CHA2DS2-VASc score of 4 warrants oral anticoagulation rather than aspirin for stroke prevention.

Question 220: Which antibiotic class most significantly inhibits CYP3A4 and increases the risk of statin-induced rhabdomyolysis?

Macrolides (Correct answer)
Tetracyclines
Fluoroquinolones
Sulfonamides

Correct answer: Macrolides

Macrolides such as clarithromycin and erythromycin inhibit CYP3A4, reducing statin metabolism, elevating plasma statin concentrations, and markedly increasing the risk of myopathy and rhabdomyolysis.

Question 221: A pharmacist is preparing a powdered formulation and needs to reduce the particle size of a coarse, crystalline substance to create a fine, uniform powder. Which non-sterile compounding technique best describes this process?

Eutectic mixing
Trituration (Correct answer)
Levigation
Spatulation

Correct answer: Trituration

Trituration is the process of rubbing, grinding, or pulverizing a powder to reduce its particle size. This is typically done in a mortar with a pestle. Levigation involves reducing particle size by triturating it in a mortar or on an ointment slab with a small amount of a liquid in which the solid is not soluble. Spatulation is the blending of powders with a spatula, and eutectic mixing refers to the liquefaction of two solids when mixed together.

Question 222: Metformin's primary glucose-lowering mechanism is best described as:

Blocking intestinal alpha-glucosidase
Decreasing hepatic gluconeogenesis (Correct answer)
Inhibiting SGLT2 in the kidney
Stimulating pancreatic insulin secretion

Correct answer: Decreasing hepatic gluconeogenesis

Metformin chiefly reduces hepatic glucose production via AMPK activation.

Question 223: Which mechanism best describes the action of montelukast?

Leukotriene receptor antagonism (Correct answer)
Mast cell stabilization
Beta-2 agonism
Anti-IgE monoclonal antibody

Correct answer: Leukotriene receptor antagonism

Montelukast blocks the CysLT1 leukotriene receptor, reducing bronchoconstriction and inflammation.

Question 224: Which drug class works by irreversibly inhibiting the proton pump (H+/K+ ATPase)?

Prostaglandin analogs
H2-receptor antagonists
Proton pump inhibitors (Correct answer)
Antacids

Correct answer: Proton pump inhibitors

PPIs covalently bind and irreversibly inhibit gastric H+/K+ ATPase.

Question 225: A patient with major depressive disorder and significant insomnia and poor appetite would benefit most from which antidepressant?

Sertraline
Bupropion
Fluoxetine
Mirtazapine (Correct answer)

Correct answer: Mirtazapine

Mirtazapine promotes sleep and increases appetite, making it well suited for depressed patients with insomnia and weight loss.

NAPLEX (North American Pharmacist Licensure) Exam

The NAPLEX (North American Pharmacist Licensure Examination) is administered by the National Association of Boards of Pharmacy (NABP). The exam consists of 225 multiple-choice questions (200 scored, 25 unscored pretest items) with a 6-hour time limit. A scaled passing score of 75 is required. The exam covers six competency areas including pharmaceutical calculations, pharmacology and mechanism of action, therapeutic plan assessment, medication safety, patient counseling, and sterile/non-sterile compounding.

225

Questions

360 min

Time Limit

75%

To Pass

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