Pharmacology Mastery Test 2026:
Drugs, Mechanisms & Adverse
Effects||Questions And Answers With
Rationales/Graded A+/2026
Update/100% Correct /Instant
Download
Total Questions: 80
Time Limit: 90 minutes
Instructions: Select the single best answer for each question.
Section A: Cardiovascular & Renal Pharmacology (Questions 1–15)
1. A 58-year-old with chronic heart failure (HFrEF) is started on
sacubitril/valsartan. Which mechanism explains its mortality benefit?
A. Selective beta-1 blockade
B. Inhibition of neprilysin and blockade of AT1 receptors – Correct
C. Direct renin inhibition with aldosterone antagonism
D. Dual endothelin receptor antagonism
*Rationale: Sacubitril inhibits neprilysin (increasing natriuretic peptides), while
valsartan blocks angiotensin II type 1 receptors. This combination reduces
preload/afterload and prevents adverse remodeling.*
2. The most common dose-limiting side effect of amiodarone is:
A. Pulmonary fibrosis
B. Corneal microdeposits
C. Thyroid dysfunction – Correct
D. Blue-gray skin discoloration
*Rationale: Amiodarone is iodine-rich and inhibits deiodinase, causing hypo- or
hyperthyroidism in 15–20% of users. Pulmonary fibrosis is serious but less
common.*
,3. A patient on apixaban for atrial fibrillation presents with acute hip fracture.
Which reversal agent is most appropriate pre-surgery?
A. Protamine sulfate
B. Vitamin K
C. Andexanet alfa – Correct
D. Idarucizumab
Rationale: Andexanet alfa reverses factor Xa inhibitors (apixaban, rivaroxaban).
Idarucizumab is for dabigatran. Protamine is for heparin.
4. The mechanism of dapagliflozin (SGLT2 inhibitor) in heart failure is
primarily:
A. Diuresis via Na-K-2Cl blockade
B. Improving cardiac energetics and reducing preload/afterload – Correct
C. Beta-1 receptor downregulation
D. Aldosterone receptor antagonism
Rationale: SGLT2 inhibitors reduce intraglomerular pressure, improve ventricular
loading, enhance ketone body utilization, and reduce inflammation, independent of
glycemic effects.
5. Which adverse effect is unique to hydralazine among direct vasodilators?
A. Tachycardia
B. Fluid retention
C. Drug-induced lupus (ANA positive) – Correct
D. Headache
Rationale: Hydralazine causes a reversible lupus-like syndrome (especially in slow
acetylators). Minoxidil does not cause lupus.
6. A patient taking verapamil develops constipation and peripheral edema.
The edema is due to:
A. Increased capillary permeability
B. Preferential arteriolar vasodilation without venodilation – Correct
C. Sodium retention from aldosterone release
D. Lymphatic obstruction
Rationale: Dihydropyridines (e.g., amlodipine) cause edema more often, but
verapamil and diltiazem also cause edema due to arteriolar dilation and increased
capillary hydrostatic pressure.
7. Which drug’s major metabolite (N-acetylprocainamide) retains
antiarrhythmic activity?
, A. Lidocaine
B. Flecainide
C. Procainamide – Correct
D. Mexiletine
Rationale: Procainamide is acetylated to NAPA, a class III antiarrhythmic
(potassium channel blocker).
8. The primary mechanism of eplerenone differs from spironolactone in that
eplerenone has:
A. Higher mineralocorticoid receptor selectivity and no anti-androgen effects
– Correct
B. Added beta-blocking activity
C. Direct nitric oxide donation
D. Inhibition of renal sympathetic nerves
Rationale: Eplerenone is more selective for MR; it does not cause gynecomastia or
menstrual irregularities.
9. A 72-year-old on digoxin presents with nausea, yellow vision, and heart rate
38 bpm. ECG shows bidirectional VT. Which is the immediate next step?
A. Phenytoin IV
B. Digoxin immune Fab fragments – Correct
C. Atropine 0.5 mg
D. Lidocaine bolus
Rationale: Bidirectional VT is pathognomonic for digoxin toxicity. Fab fragments
bind digoxin directly.
10. The β-blocker with the greatest intrinsic sympathomimetic activity (ISA)
is:
A. Metoprolol
B. Atenolol
C. Pindolol – Correct
D. Carvedilol
Rationale: Pindolol has partial agonist activity at beta-receptors, causing less
bradycardia but less mortality benefit in heart failure.
11. Ivabradine lowers heart rate by:
A. Blocking beta-1 receptors
B. Inhibiting the If channel in the sinoatrial node – Correct
C. Activating M2 muscarinic receptors
Drugs, Mechanisms & Adverse
Effects||Questions And Answers With
Rationales/Graded A+/2026
Update/100% Correct /Instant
Download
Total Questions: 80
Time Limit: 90 minutes
Instructions: Select the single best answer for each question.
Section A: Cardiovascular & Renal Pharmacology (Questions 1–15)
1. A 58-year-old with chronic heart failure (HFrEF) is started on
sacubitril/valsartan. Which mechanism explains its mortality benefit?
A. Selective beta-1 blockade
B. Inhibition of neprilysin and blockade of AT1 receptors – Correct
C. Direct renin inhibition with aldosterone antagonism
D. Dual endothelin receptor antagonism
*Rationale: Sacubitril inhibits neprilysin (increasing natriuretic peptides), while
valsartan blocks angiotensin II type 1 receptors. This combination reduces
preload/afterload and prevents adverse remodeling.*
2. The most common dose-limiting side effect of amiodarone is:
A. Pulmonary fibrosis
B. Corneal microdeposits
C. Thyroid dysfunction – Correct
D. Blue-gray skin discoloration
*Rationale: Amiodarone is iodine-rich and inhibits deiodinase, causing hypo- or
hyperthyroidism in 15–20% of users. Pulmonary fibrosis is serious but less
common.*
,3. A patient on apixaban for atrial fibrillation presents with acute hip fracture.
Which reversal agent is most appropriate pre-surgery?
A. Protamine sulfate
B. Vitamin K
C. Andexanet alfa – Correct
D. Idarucizumab
Rationale: Andexanet alfa reverses factor Xa inhibitors (apixaban, rivaroxaban).
Idarucizumab is for dabigatran. Protamine is for heparin.
4. The mechanism of dapagliflozin (SGLT2 inhibitor) in heart failure is
primarily:
A. Diuresis via Na-K-2Cl blockade
B. Improving cardiac energetics and reducing preload/afterload – Correct
C. Beta-1 receptor downregulation
D. Aldosterone receptor antagonism
Rationale: SGLT2 inhibitors reduce intraglomerular pressure, improve ventricular
loading, enhance ketone body utilization, and reduce inflammation, independent of
glycemic effects.
5. Which adverse effect is unique to hydralazine among direct vasodilators?
A. Tachycardia
B. Fluid retention
C. Drug-induced lupus (ANA positive) – Correct
D. Headache
Rationale: Hydralazine causes a reversible lupus-like syndrome (especially in slow
acetylators). Minoxidil does not cause lupus.
6. A patient taking verapamil develops constipation and peripheral edema.
The edema is due to:
A. Increased capillary permeability
B. Preferential arteriolar vasodilation without venodilation – Correct
C. Sodium retention from aldosterone release
D. Lymphatic obstruction
Rationale: Dihydropyridines (e.g., amlodipine) cause edema more often, but
verapamil and diltiazem also cause edema due to arteriolar dilation and increased
capillary hydrostatic pressure.
7. Which drug’s major metabolite (N-acetylprocainamide) retains
antiarrhythmic activity?
, A. Lidocaine
B. Flecainide
C. Procainamide – Correct
D. Mexiletine
Rationale: Procainamide is acetylated to NAPA, a class III antiarrhythmic
(potassium channel blocker).
8. The primary mechanism of eplerenone differs from spironolactone in that
eplerenone has:
A. Higher mineralocorticoid receptor selectivity and no anti-androgen effects
– Correct
B. Added beta-blocking activity
C. Direct nitric oxide donation
D. Inhibition of renal sympathetic nerves
Rationale: Eplerenone is more selective for MR; it does not cause gynecomastia or
menstrual irregularities.
9. A 72-year-old on digoxin presents with nausea, yellow vision, and heart rate
38 bpm. ECG shows bidirectional VT. Which is the immediate next step?
A. Phenytoin IV
B. Digoxin immune Fab fragments – Correct
C. Atropine 0.5 mg
D. Lidocaine bolus
Rationale: Bidirectional VT is pathognomonic for digoxin toxicity. Fab fragments
bind digoxin directly.
10. The β-blocker with the greatest intrinsic sympathomimetic activity (ISA)
is:
A. Metoprolol
B. Atenolol
C. Pindolol – Correct
D. Carvedilol
Rationale: Pindolol has partial agonist activity at beta-receptors, causing less
bradycardia but less mortality benefit in heart failure.
11. Ivabradine lowers heart rate by:
A. Blocking beta-1 receptors
B. Inhibiting the If channel in the sinoatrial node – Correct
C. Activating M2 muscarinic receptors
