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: Statins reduce cholesterol levels by inhibiting
A) Lipase activity
B) Bile production
C) Insulin release
D) HMG-CoA reductase
✅ Correct Answer: D
Explanation: Statins block the rate-limiting enzyme in cholesterol synthesis.
Q: Glucocorticoids suppress inflammation by reducing
A) Cytokine production
B) Heart rate
C) Platelet count
D) Iron absorption
✅ Correct Answer: A
Explanation: These hormones decrease inflammatory signals like interleukins and TNF.
Q: Phenytoin is mainly used for the management of
A) Seizures
B) Hypertension
C) Tuberculosis
D) Ulcers
✅ Correct Answer: A
Explanation: Phenytoin stabilizes neuronal membranes to prevent seizure activity.
Q: The antidote for organophosphate poisoning is
A) Naloxone
B) Heparin
C) Diazepam
D) Atropine
✅ Correct Answer: D
Explanation: Atropine blocks muscarinic effects of acetylcholine excess.
Q: Bisphosphonates help prevent
A) Hair loss
B) Bone resorption
C) Muscle fatigue
D) Blood clotting
✅ Correct Answer: B
Explanation: These drugs inhibit osteoclast-mediated bone breakdown.
Q: Vancomycin is reserved for serious infections caused by
A) Protozoa
B) Gram-negative bacteria
C) Gram-positive bacteria
D) Viruses
✅ Correct Answer: C
Explanation: Vancomycin targets resistant gram-positive organisms like MRSA.
Q: A major side effect of thiazide diuretics includes
A) Hypokalemia
B) Hypercalcemia
C) Tachycardia
D) Hyperglycemia
✅ Correct Answer: A
Explanation: Thiazides promote potassium loss in urine.
Q: The therapeutic effect of digoxin is mainly due to increased
A) Cardiac contractility
B) Renal excretion
C) Liver metabolism
D) Blood viscosity
✅ Correct Answer: A
Explanation: Digoxin enhances calcium availability in cardiac cells, boosting contraction.
Q: Monoclonal antibodies are produced using
A) DNA fingerprinting
B) Hybridoma technology
C) Radiolabeling
D) Fermentation
✅ Correct Answer: B
Explanation: Hybridoma cells combine mouse B cells with tumor cells to produce antibodies.
Q: Levodopa helps Parkinson’s patients by increasing
A) Dopamine levels
B) Histamine receptors
C) Acetylcholine action
D) GABA synthesis
✅ Correct Answer: A
Explanation: Levodopa is converted to dopamine in the brain to restore motor control.