Pharmacology MCQs
Pharmacology MCQs help learners understand the actions, interactions, uses, and side effects of various drugs. These questions cover pharmacokinetics, pharmacodynamics, drug classifications, and toxicology. Practicing them aids in mastering this crucial medical subject and performing well in exams such as MDCAT, USMLE, FCPS, and NTS.
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.
Q: Tetracyclines inhibit bacterial growth by blocking
A) DNA replication
B) Protein synthesis
C) Cell wall formation
D) Lipid metabolism
✅ Correct Answer: B
Explanation: Tetracyclines bind to the 30S ribosomal subunit to prevent protein synthesis.
Q: Dopamine agonists are prescribed in
A) Depression
B) Diabetes
C) Parkinson’s disease
D) Tuberculosis
✅ Correct Answer: C
Explanation: Dopamine agonists improve motor symptoms in Parkinson’s disease.
Q: Anaphylactic shock is treated with
A) Epinephrine
B) Lorazepam
C) Warfarin
D) Insulin
✅ Correct Answer: A
Explanation: Epinephrine rapidly reverses airway constriction and hypotension during anaphylaxis.
Q: Heparin acts immediately by inhibiting
A) Platelets
B) Thrombin
C) Erythropoietin
D) Lipase
✅ Correct Answer: B
Explanation: Heparin activates antithrombin III, which inactivates thrombin and factor Xa.
Q: ACE inhibitors lower blood pressure by reducing
A) Sodium levels
B) Angiotensin II
C) Calcium influx
D) Glucose reabsorption
✅ Correct Answer: B
Explanation: ACE inhibitors prevent the formation of angiotensin II, a potent vasoconstrictor.