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: Most common side effect of opioids
A) Cough
B) Constipation
C) Diarrhea
D) Hypertension
✅ Correct Answer: B
Explanation: Opioids decrease gastrointestinal motility, leading to constipation.
Q: Selective serotonin reuptake inhibitor (SSRI) example
A) Phenelzine
B) Amitriptyline
C) Sertraline
D) Imipramine
✅ Correct Answer: C
Explanation: Sertraline increases serotonin levels by inhibiting its reuptake into presynaptic neurons.
Q: Mechanism of action of furosemide
A) Inhibits aldosterone
B) Inhibits carbonic anhydrase
C) Inhibits Na⁺-K⁺-2Cl⁻ transporter in loop of Henle
D) Inhibits Na⁺-Cl⁻ symporter in DCT
✅ Correct Answer: C
Explanation: Furosemide blocks sodium, potassium, and chloride reabsorption in the thick ascending limb.
Q: Antibiotic causing tendon rupture
A) Ciprofloxacin
B) Azithromycin
C) Cephalexin
D) Amoxicillin
✅ Correct Answer: A
Explanation: Fluoroquinolones like ciprofloxacin are associated with tendon damage, especially in elderly patients.
Q: Antidote used for paracetamol overdose
A) Pralidoxime
B) Atropine
C) Flumazenil
D) N-acetylcysteine
✅ Correct Answer: D
Explanation: N-acetylcysteine replenishes glutathione, which detoxifies the harmful metabolite of paracetamol.