Free Doctor of Pharmacy Questions and Answers — Questions and Answers
Question 1: Which of the following best describes how acetaminophen is metabolized?
- Sulfation
- Cytochrome P-450 oxidation
- Plasma breakdown
- Glucuronidation (Correct answer)
Correct answer: Glucuronidation
Acetaminophen (paracetamol) is primarily metabolized in the liver through conjugation reactions, with glucuronidation being the major pathway. This process involves attaching a glucuronic acid molecule to acetaminophen, forming a more water-soluble metabolite that can be easily excreted from the body.
Question 2: A 15-year-old appears with nasal congestion and thin, clear rhinorrhea that has lasted for six days. She reports some minor facial soreness but no fevers. She thinks her symptoms are getting better. Which factor accounts for her symptoms most likely?
- Staphylococcus aureus
- Streptococcus pneumoniae
- Viral (Correct answer)
- Moraxella catarrhalis
Correct answer: Viral
The patient's symptoms of nasal congestion, thin clear rhinorrhea, minor facial soreness, and absence of fever, lasting six days and improving, are highly characteristic of a common viral upper respiratory infection (URI). Bacterial sinusitis typically presents with more severe symptoms, purulent discharge, and often worsening symptoms after an initial improvement or persistence beyond 7-10 days.
Question 3: A woman in her 72s is going through a severe depression episode. Her medical history includes glaucoma, chronic obstructive pulmonary disease, sick sinus syndrome, atrial fibrillation while taking anticoagulant therapy, and coronary artery disease. Which drug from the list below is ideal for treating her depression?
- Doxepin
- Escitalopram (Correct answer)
- Amitriptyline
- Nortriptyline
Correct answer: Escitalopram
Escitalopram, a selective serotonin reuptake inhibitor (SSRI), is generally preferred for elderly patients with depression due to its favorable side effect profile compared to tricyclic antidepressants (TCAs). TCAs like doxepin, amitriptyline, and nortriptyline have significant anticholinergic and cardiac side effects that would be problematic given the patient's glaucoma, COPD, sick sinus syndrome, and atrial fibrillation.
Question 4: What anti-thyroid treatment is most effective for pregnant women with clinically severe hyperthyroidism?
- Propylthiouracil first trimester followed by methimazole for the remainder of pregnancy (Correct answer)
- Methimazole first trimester followed by propylthiouracil for the remainder of pregnancy
- Stop treatment and resume post-partum
- Propylthiouracil
Correct answer: Propylthiouracil first trimester followed by methimazole for the remainder of pregnancy
Propylthiouracil (PTU) is the preferred anti-thyroid drug during the first trimester of pregnancy because methimazole (MMI) has been associated with a higher risk of teratogenicity, specifically aplasia cutis. After the first trimester, methimazole is generally preferred due to its longer half-life and less frequent dosing, and the risk of teratogenicity decreases.
Question 5: Which of the following statements about medication absorption is accurate?
- Grape juice activates P-glycoprotein leading to substantial inhibition of absorption of drugs
- After oral ingestion of drugs, the absorption of drug may be incomplete (Correct answer)
- Drugs which are too lipophilic cannot cross the lipid cell membrane
- P-glycoprotein is an efflux transporter which is present in the enterocytes and it enhances the absorption of drug
Correct answer: After oral ingestion of drugs, the absorption of drug may be incomplete
Drug absorption after oral ingestion is frequently incomplete due to various physiological and physicochemical factors. These can include poor solubility, degradation by gastric acid or enzymes, extensive first-pass metabolism in the liver, and efflux by drug transporters like P-glycoprotein, meaning not all of the administered dose reaches systemic circulation.
Question 6: Your patient, a 58-year-old man, complains of sudden, intense shortness of breath and substernal chest pain. He is en route to the cardiac catheterization suite for percutaneous coronary intervention after an ECG reveals an acute STEMI. Which of the following medications used to treat acute coronary syndromes with PCI requires oxidation to an active form by hepatic P450 enzymes?
- Warfarin
- Eptifibatide
- Clopidogrel (Correct answer)
- Ticlopidine
Correct answer: Clopidogrel
Clopidogrel is a prodrug, meaning it is inactive until it undergoes metabolic activation in the liver. This activation is primarily mediated by hepatic cytochrome P450 (CYP) enzymes, particularly CYP2C19, to form its active metabolite, which then inhibits platelet aggregation.
Question 7: Dapsone, clofazimine, and rifampin are being taken by a patient with multibacillary leprosy. Which of the following statements about the drugs on this list actually describes how they work?
- Rifampin is bacteriostatic by inhibiting RNA synthesis by blocking DNA-dependent RNA polymerase
- Rifampin is bactericidal by inhibiting RNA synthesis by blocking DNA-dependent RNA polymerase (Correct answer)
- Dapsone is bacteriostatic because of its inhibitory effects on myeloperoxidase
- Clofazimine is bactericidal by directly inhibiting bacterial DNA polymerase
Correct answer: Rifampin is bactericidal by inhibiting RNA synthesis by blocking DNA-dependent RNA polymerase
Rifampin is a potent bactericidal antibiotic that exerts its effect by inhibiting bacterial DNA-dependent RNA polymerase. This mechanism prevents the synthesis of RNA, thereby disrupting bacterial protein synthesis and ultimately leading to bacterial cell death.
