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: Aspirin inhibits pain by blocking
A) Sodium channels
B) COX enzymes
C) Beta receptors
D) Calcium receptors
✅ Correct Answer: B
Explanation: Aspirin blocks cyclooxygenase enzymes, reducing prostaglandin synthesis and inflammation.
Q: Paracetamol primarily acts on
A) Central nervous system
B) Liver cells
C) Respiratory tract
D) Kidneys
✅ Correct Answer: A
Explanation: Paracetamol works centrally to reduce fever and pain without strong anti-inflammatory effects.
Q: Beta-blockers lower blood pressure by decreasing
A) Blood glucose
B) Heart rate
C) Oxygen saturation
D) Platelet count
✅ Correct Answer: B
Explanation: Beta-blockers reduce cardiac output by slowing the heart rate.
Q: Warfarin prevents clot formation by inhibiting
A) Vitamin K action
B) Platelet aggregation
C) Fibrin production
D) Calcium absorption
✅ Correct Answer: A
Explanation: Warfarin antagonizes vitamin K, crucial for synthesizing clotting factors.
Q: Atropine is classified as an
A) Antiviral agent
B) Anticholinergic drug
C) Antihistamine
D) Beta agonist
✅ Correct Answer: B
Explanation: Atropine blocks muscarinic receptors, reducing parasympathetic activity.