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: Insulin lowers blood glucose by promoting
A) Protein breakdown
B) Hormone inhibition
C) Fat oxidation
D) Cellular uptake
✅ Correct Answer: D
Explanation: Insulin facilitates glucose uptake into cells, reducing blood sugar levels.
Q: Morphine may cause respiratory depression by suppressing
A) Alveolar function
B) Cough reflex
C) Nasal airflow
D) Brainstem activity
✅ Correct Answer: D
Explanation: Morphine depresses the respiratory center in the medulla.
Q: Antihistamines alleviate allergies by blocking
A) T cell activation
B) Cytokine production
C) Neutrophil migration
D) Histamine receptors
✅ Correct Answer: D
Explanation: Antihistamines block H1 receptors to reduce allergy symptoms.
Q: Proton pump inhibitors reduce acid secretion by targeting
A) Beta-2 receptor
B) Sodium channel
C) COX-2 enzyme
D) H+/K+ ATPase
✅ Correct Answer: D
Explanation: PPIs block the gastric proton pump, decreasing acid production.
Q: Diuretics reduce blood pressure by increasing
A) Oxygen supply
B) Liver metabolism
C) Hemoglobin levels
D) Urine output
✅ Correct Answer: D
Explanation: Diuretics promote sodium and water excretion, lowering blood volume.