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: Metronidazole targets anaerobic organisms by damaging
A) Cell membranes
B) DNA structure
C) ATP synthase
D) Protein receptors
✅ Correct Answer: B
Explanation: Metronidazole forms toxic intermediates that bind and fragment DNA.
Q: Haloperidol is classified as a
A) Beta blocker
B) SSRI
C) Typical antipsychotic
D) Diuretic
✅ Correct Answer: C
Explanation: It blocks dopamine receptors to control psychotic symptoms.
Q: Beta-blockers lower blood pressure by reducing
A) Blood sugar
B) Kidney filtration
C) Heart rate
D) Bile secretion
✅ Correct Answer: C
Explanation: These drugs decrease cardiac output and suppress renin release.
Q: The function of naloxone in opioid overdose is to
A) Block histamine
B) Reverse opioid binding
C) Enhance opioid action
D) Stimulate GABA
✅ Correct Answer: B
Explanation: Naloxone is a competitive antagonist at opioid receptors.
Q: First-generation antihistamines often cause
A) Sedation
B) Diarrhea
C) Tachycardia
D) Hypertension
✅ Correct Answer: A
Explanation: Their ability to cross the blood-brain barrier leads to drowsiness.