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: Tetracyclines must not be taken with dairy due to
A) Chelation with calcium
B) Increased absorption
C) Enzyme induction
D) Delayed excretion
✅ Correct Answer: A
Explanation: Calcium binds tetracycline, reducing its gastrointestinal absorption.
Q: Carbamazepine is useful in treating
A) Hypertension
B) Tuberculosis
C) Ulcers
D) Partial seizures
✅ Correct Answer: D
Explanation: It stabilizes neuronal membranes by blocking voltage-gated sodium channels.
Q: The analgesic effect of NSAIDs results from inhibition of
A) Acetylcholine activity
B) Prostaglandin synthesis
C) Dopamine pathways
D) GABA receptors
✅ Correct Answer: B
Explanation: NSAIDs block cyclooxygenase enzymes involved in prostaglandin production.
Q: Sildenafil improves erectile function by enhancing
A) Beta oxidation
B) Estrogen production
C) cGMP levels
D) Calcium influx
✅ Correct Answer: C
Explanation: It inhibits phosphodiesterase-5, prolonging cGMP-mediated vasodilation.
Q: The main adverse effect of chloramphenicol is
A) Aplastic anemia
B) Tinnitus
C) Gingival hyperplasia
D) Tachycardia
✅ Correct Answer: A
Explanation: Chloramphenicol can severely suppress bone marrow function.