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: Drug contraindicated in pregnancy due to teratogenicity
A) Tetracycline
B) Acetaminophen
C) Amoxicillin
D) Metoclopramide
✅ Correct Answer: A
Explanation: Tetracyclines can cause tooth discoloration and bone deformities in the fetus.
Q: Phenytoin acts by
A) Blocking calcium channels
B) Inhibiting sodium channels
C) Activating potassium channels
D) Enhancing GABA
✅ Correct Answer: B
Explanation: Phenytoin stabilizes neuronal membranes by inhibiting sodium channels.
Q: Prodrug converted to active metabolite in body
A) Enalapril
B) Furosemide
C) Penicillin
D) Morphine
✅ Correct Answer: A
Explanation: Enalapril is metabolized in the liver to enalaprilat, its active form.
Q: Long-term use of corticosteroids may cause
A) Cushingoid features
B) Bradycardia
C) Anemia
D) Hyperkalemia
✅ Correct Answer: A
Explanation: Chronic corticosteroid therapy leads to symptoms resembling Cushing’s syndrome.
Q: Adverse effect of isoniazid
A) Peripheral neuropathy
B) Skin pigmentation
C) Optic neuritis
D) Alopecia
✅ Correct Answer: A
Explanation: Isoniazid interferes with vitamin B6 metabolism, leading to peripheral neuropathy.