Saudi Prometric Pharmacist Clinical Pharmacy and Therapeutics 2 — Questions and Answers
Question 1: A patient with peptic ulcer disease positive for H. pylori is prescribed triple therapy. Which regimen is standard first-line?
- PPI + clarithromycin + amoxicillin for 14 days (Correct answer)
- PPI alone for 8 weeks
- Metronidazole + tetracycline + bismuth for 7 days
- Omeprazole + azithromycin for 10 days
Correct answer: PPI + clarithromycin + amoxicillin for 14 days
Standard first-line H. pylori eradication is triple therapy: PPI + clarithromycin + amoxicillin (or metronidazole if penicillin allergy) for 10–14 days. 14 days provides higher eradication rates. Quadruple therapy (with bismuth) is used in areas with high clarithromycin resistance.
Question 2: A pharmacist is reviewing a patient with systolic heart failure (HFrEF). Which four drug classes have mortality benefit in HFrEF?
- ACE inhibitor/ARB/ARNI + beta-blocker + MRA + SGLT2 inhibitor (now 'fantastic four') (Correct answer)
- Digoxin + loop diuretic + aspirin + ACE inhibitor
- Calcium channel blocker + ARB + statin + diuretic
- Beta-blocker + nitrate + ARNI + digoxin
Correct answer: ACE inhibitor/ARB/ARNI + beta-blocker + MRA + SGLT2 inhibitor (now 'fantastic four')
Evidence-based therapy for HFrEF (EF <40%) with mortality benefit: (1) ACE inhibitor/ARB or ARNI (sacubitril/valsartan), (2) beta-blocker (carvedilol/bisoprolol/metoprolol succinate), (3) mineralocorticoid receptor antagonist (spironolactone/eplerenone), (4) SGLT2 inhibitor (dapagliflozin/empagliflozin). Loop diuretics reduce symptoms but not mortality.
Question 3: A patient with COPD is on a long-acting beta-2 agonist (LABA). Which combination is recommended to further reduce exacerbations in severe COPD?
- LABA + long-acting muscarinic antagonist (LAMA) combination inhaler (Correct answer)
- LABA alone is sufficient for all COPD stages
- LABA + inhaled corticosteroid (ICS) alone for all COPD patients
- Add oral theophylline as second-line before combination inhalers
Correct answer: LABA + long-acting muscarinic antagonist (LAMA) combination inhaler
For moderate-severe COPD, LABA + LAMA dual bronchodilation is the cornerstone of maintenance therapy, providing superior bronchodilation and exacerbation reduction compared to either alone. ICS is added (triple therapy: ICS/LABA/LAMA) in patients with frequent exacerbations or eosinophilia.
Question 4: A 70-year-old patient is on warfarin (INR 2.5) and develops a significant GI bleed. What is the most rapid reversal option?
- 4-factor prothrombin complex concentrate (PCC) plus IV vitamin K (Correct answer)
- Vitamin K alone — wait 6–24 hours
- Fresh frozen plasma (FFP) alone — 15–20 mL/kg
- Stop warfarin and observe
Correct answer: 4-factor prothrombin complex concentrate (PCC) plus IV vitamin K
For life-threatening warfarin-related bleeding, 4-factor PCC (contains factors II, VII, IX, X, and proteins C and S) provides rapid (minutes) INR reversal and is preferred over FFP (which requires large volumes and 30–60 min). IV vitamin K ensures sustained reversal after PCC.
Question 5: A patient is prescribed lithium for bipolar disorder. Which drug interaction can precipitously raise lithium levels and cause toxicity?
- NSAIDs and thiazide diuretics — reduce renal lithium excretion (Correct answer)
- Beta-blockers — reduce lithium renal clearance
- Caffeine — increases lithium absorption
- Antacids — raise gastric pH improving lithium absorption
Correct answer: NSAIDs and thiazide diuretics — reduce renal lithium excretion
NSAIDs reduce renal prostaglandin synthesis, causing sodium retention and reduced renal lithium excretion. Thiazide diuretics cause sodium depletion; the kidney compensates by reabsorbing more sodium (and lithium together) in the proximal tubule. Both dramatically raise lithium levels.
Question 6: A pharmacist reviews a prescription for a patient with gout flare. What is the first-line treatment for an acute gout attack?
- Colchicine (within 12–24 hours of onset), NSAIDs, or corticosteroids (Correct answer)
- Allopurinol — start immediately during the acute attack
- Probenecid — uricosuric agent for immediate relief
- IV pegloticase for all acute gout attacks
Correct answer: Colchicine (within 12–24 hours of onset), NSAIDs, or corticosteroids
Acute gout is treated with anti-inflammatory agents: colchicine (most effective if started within 12–24 hours), NSAIDs (e.g., indomethacin), or corticosteroids. Allopurinol should NOT be started during an acute attack (can prolong or worsen it) — it is initiated 2–4 weeks after resolution for chronic urate lowering.
Saudi Prometric Pharmacist Clinical Pharmacy and Therapeutics 2
A patient with peptic ulcer disease positive for H. pylori is prescribed triple therapy.
Which regimen is standard first-line?