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: Sulfonylureas help manage diabetes by stimulating
A) Fat metabolism
B) Protein synthesis
C) Insulin secretion
D) Glucagon release
✅ Correct Answer: C
Explanation: Sulfonylureas increase insulin release from pancreatic beta cells.
Q: Nitroglycerin relieves chest pain through
A) Vasodilation
B) Muscle relaxation
C) Anticoagulation
D) Bronchodilation
✅ Correct Answer: A
Explanation: Nitroglycerin relaxes vascular smooth muscle, reducing cardiac workload.
Q: Fluoroquinolones exert antibacterial action by inhibiting
A) DNA gyrase
B) Cell wall synthesis
C) Peptidoglycan linkage
D) Ribosomal subunits
✅ Correct Answer: A
Explanation: These antibiotics disrupt bacterial DNA replication by targeting DNA gyrase.
Q: SSRIs are commonly prescribed to treat
A) Hypertension
B) Asthma
C) Depression
D) Epilepsy
✅ Correct Answer: C
Explanation: SSRIs increase serotonin levels in the brain, improving mood.
Q: Methotrexate interferes with cell division by inhibiting
A) Glucose absorption
B) Iron transport
C) Lipid synthesis
D) Folate metabolism
✅ Correct Answer: D
Explanation: Methotrexate blocks dihydrofolate reductase, essential for DNA synthesis.
Q: Rifampin is a cornerstone in the treatment of
A) Tuberculosis
B) Anemia
C) Malaria
D) Hypertension
✅ Correct Answer: A
Explanation: Rifampin inhibits bacterial RNA synthesis, especially in Mycobacterium tuberculosis.
Q: Adverse effects of aminoglycosides often include
A) Hyperglycemia
B) Nephrotoxicity
C) Constipation
D) Bradycardia
✅ Correct Answer: B
Explanation: Aminoglycosides may damage kidney function and require dosage monitoring.
Q: Lidocaine is widely used as a
A) Laxative
B) Local anesthetic
C) Diuretic
D) Antihistamine
✅ Correct Answer: B
Explanation: Lidocaine blocks sodium channels in nerves, preventing pain transmission.
Q: Acetaminophen overdose may cause severe damage to the
A) Heart
B) Liver
C) Pancreas
D) Lungs
✅ Correct Answer: B
Explanation: Hepatotoxicity is the major risk in high doses of acetaminophen.
Q: Clindamycin is known for its risk of causing
A) Renal stones
B) C. difficile colitis
C) Seizures
D) Skin rash
✅ Correct Answer: B
Explanation: Clindamycin may disrupt gut flora, leading to Clostridioides difficile overgrowth.