Pharmacology MCQs
Pharmacology MCQs test knowledge of drug actions, interactions, classifications, pharmacokinetics, pharmacodynamics, and toxicology. Ideal for MDCAT, USMLE, FCPS, and NTS preparation, these quizzes strengthen medical understanding and boost exam performance through targeted practice.
Q: Effect of beta-blockers on the heart
A) Promote vasodilation
B) Enhance conduction
C) Increase heart rate
D) Decrease contractility
✅ Correct Answer: D
Explanation: Beta-blockers reduce cardiac output by lowering contractility and heart rate.
Q: First-line drug for anaphylaxis
A) Salbutamol
B) Epinephrine
C) Prednisone
D) Diphenhydramine
✅ Correct Answer: B
Explanation: Epinephrine rapidly counteracts bronchoconstriction and hypotension in anaphylaxis.
Q: Reversible cholinesterase inhibitor
A) Atropine
B) Succinylcholine
C) Pralidoxime
D) Neostigmine
✅ Correct Answer: D
Explanation: Neostigmine temporarily inhibits acetylcholinesterase, increasing acetylcholine levels.
Q: Metformin primarily acts by
A) Blocking glucagon receptors
B) Inhibiting gluconeogenesis
C) Stimulating insulin secretion
D) Promoting glycogenolysis
✅ Correct Answer: B
Explanation: Metformin lowers blood glucose by reducing hepatic glucose production.
Q: Drug causing disulfiram-like reaction with alcohol
A) Azithromycin
B) Metronidazole
C) Ceftriaxone
D) Amoxicillin
✅ Correct Answer: B
Explanation: Metronidazole inhibits aldehyde dehydrogenase, leading to a reaction with alcohol.