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: Naloxone is used to reverse
A) Opioid overdose
B) Asthma attack
C) Hyperglycemia
D) Hypertension
✅ Correct Answer: A
Explanation: Naloxone is an opioid antagonist that rapidly reverses opioid effects.
Q: Diazepam enhances the action of
A) Dopamine
B) Acetylcholine
C) GABA
D) Serotonin
✅ Correct Answer: C
Explanation: Diazepam binds to GABA receptors, enhancing inhibitory neurotransmission.
Q: Antacids relieve heartburn by neutralizing
A) Hormones
B) Gastric acid
C) Enzymes
D) Lipids
✅ Correct Answer: B
Explanation: Antacids raise stomach pH by neutralizing hydrochloric acid.
Q: The bioavailability of oral drugs is influenced by
A) Light exposure
B) First-pass metabolism
C) Skin temperature
D) Injection technique
✅ Correct Answer: B
Explanation: Oral drugs undergo liver metabolism before entering systemic circulation.
Q: Drugs with narrow therapeutic index require
A) Rare usage
B) Close monitoring
C) No prescription
D) High dosage
✅ Correct Answer: B
Explanation: Narrow therapeutic index drugs need careful dose control to avoid toxicity.