Drug-induced renal disease: prevention and management MCQs With Answer

Drug-induced renal disease: prevention and management MCQs With Answer

Introduction: Drug-induced renal disease is a critical topic for M.Pharm students preparing to counsel clinicians on safe pharmacotherapy. This set of MCQs focuses on pathophysiology, commonly implicated drugs, early detection, preventive strategies and evidence-based management of nephrotoxic drug reactions. Questions emphasize mechanism-based understanding — for example hemodynamic, tubular, interstitial and obstructive injuries — and practical prevention: hydration protocols, dose adjustment by renal function, drug-drug interactions, and antidotes or protective agents. Answers highlight best practices for monitoring and interventions including when to stop a drug, when to use corticosteroids, and when renal replacement therapy is indicated.

Q1. What is the principal renal lesion caused by aminoglycoside antibiotics leading to nephrotoxicity?

• Immune complex deposition in glomeruli
• Proximal tubular epithelial cell necrosis resulting in acute tubular necrosis
• Interstitial fibrosis with chronic nephritis
• Obstructive crystalline nephropathy

Correct Answer: Proximal tubular epithelial cell necrosis resulting in acute tubular necrosis

Q2. Which mechanism best explains NSAID-induced acute kidney injury?

• Direct tubular cytotoxicity causing proximal tubular necrosis
• Inhibition of renal prostaglandin synthesis causing afferent arteriole vasoconstriction and reduced GFR
• Immune-mediated glomerulonephritis
• Formation of uric acid crystals in renal tubules

Correct Answer: Inhibition of renal prostaglandin synthesis causing afferent arteriole vasoconstriction and reduced GFR

Q3. Which is the most evidence-based primary preventive measure for contrast-induced acute kidney injury (CI-AKI)?

• High-dose N-acetylcysteine routinely for all patients
• Peri-procedural isotonic saline hydration
• Oral sodium bicarbonate for 7 days before procedure
• Routine use of mannitol to force diuresis

Correct Answer: Peri-procedural isotonic saline hydration

Q4. Why can ACE inhibitors cause an acute rise in serum creatinine in some patients?

• They constrict the afferent arteriole increasing glomerular capillary pressure
• They dilate the efferent arteriole by blocking angiotensin II effects, reducing glomerular filtration pressure
• They cause tubular obstruction by crystals
• They directly destroy glomerular endothelial cells

Correct Answer: They dilate the efferent arteriole by blocking angiotensin II effects, reducing glomerular filtration pressure

Q5. Which antimicrobial is classically associated with crystal-induced obstructive nephropathy when given intravenously at high doses or without adequate hydration?

• Vancomycin
• Acyclovir
• Linezolid
• Ceftriaxone

Correct Answer: Acyclovir

Q6. The recommended initial management for drug-induced acute interstitial nephritis (AIN) includes:

• Immediate renal biopsy in all suspected patients only
• Continue the suspected drug and observe for improvement
• Discontinue the offending agent and consider corticosteroid therapy if renal function does not promptly improve
• Start high-dose aminoglycoside antibiotics

Correct Answer: Discontinue the offending agent and consider corticosteroid therapy if renal function does not promptly improve

Q7. For aminoglycoside therapy, which monitoring strategy most helps reduce nephrotoxicity risk?

• Daily measurement of C-reactive protein
• Monitoring trough (pre-dose) aminoglycoside concentrations and renal function
• Only monitoring peak levels without renal function tests
• Routine urine cultures every 12 hours

Correct Answer: Monitoring trough (pre-dose) aminoglycoside concentrations and renal function

Q8. Which agent is used to reduce cisplatin-induced nephrotoxicity in high-risk patients?

• Amifostine
• Nitrofurantoin
• Probenecid
• Allopurinol

Correct Answer: Amifostine

Q9. Vancomycin nephrotoxicity risk is increased most by which of the following co-prescriptions?

• Beta-lactam antibiotics such as amoxicillin
• Aminoglycosides such as gentamicin
• Oral macrolides such as azithromycin
• Topical mupirocin

Correct Answer: Aminoglycosides such as gentamicin

Q10. Which anticoagulant commonly requires dose adjustment or monitoring in patients with reduced renal function to prevent bleeding complications?

• Warfarin
• Enoxaparin
• Heparin (unfractionated) with standard dosing)
• Aspirin

Correct Answer: Enoxaparin

Q11. Which biomarker is emerging as an earlier indicator of acute kidney injury than serum creatinine?

• Serum alanine aminotransferase (ALT)
• Neutrophil gelatinase-associated lipocalin (NGAL)
• C-reactive protein (CRP)
• Fasting blood glucose

Correct Answer: Neutrophil gelatinase-associated lipocalin (NGAL)

Q12. Which dosing strategy for aminoglycosides has been shown to reduce nephrotoxicity while maintaining efficacy in many infections?

• Multiple daily low doses with no level monitoring
• Once-daily high-dose administration with monitoring of trough levels
• Continuous intravenous infusion for 7 days
• Alternating daily dosing with beta-lactams

Correct Answer: Once-daily high-dose administration with monitoring of trough levels

Q13. Which formulation of amphotericin B is associated with lower risk of nephrotoxicity compared with conventional amphotericin B deoxycholate?

• Liposomal amphotericin B
• Oral amphotericin suspension
• Amphotericin B combined with gentamicin
• Amphotericin B prodrug

Correct Answer: Liposomal amphotericin B

Q14. Combining which two lipid-lowering agents notably increases risk of severe rhabdomyolysis and consequent renal injury?

• Statin with fibrate (e.g., simvastatin + gemfibrozil)
• Bile acid sequestrant with ezetimibe
• Niacin with omega-3 fatty acids
• PCSK9 inhibitor with low-dose statin

Correct Answer: Statin with fibrate (e.g., simvastatin + gemfibrozil)

Q15. Best practice regarding metformin when a patient with reduced renal function is scheduled for radiocontrast administration?

• Continue metformin without changes in all patients
• Stop metformin at time of contrast and withhold for 48 hours, reassess renal function before restarting in at-risk patients
• Double the metformin dose the day before procedure
• Replace metformin with glyburide immediately

Correct Answer: Stop metformin at time of contrast and withhold for 48 hours, reassess renal function before restarting in at-risk patients

Q16. Which urinalysis finding is most characteristic of acute tubular necrosis from nephrotoxic drugs?

• Red blood cell casts predominating
• Muddy brown granular casts
• Heavy albuminuria (>3.5 g/day) with oval fat bodies
• Purely white cell casts without other sediment

Correct Answer: Muddy brown granular casts

Q17. Administration of ACE inhibitors is relatively contraindicated in which renal vascular condition due to risk of precipitous renal failure?

• Bilateral renal artery stenosis
• Renal papillary necrosis
• Simple renal cysts
• Chronic pyelonephritis with scarring

Correct Answer: Bilateral renal artery stenosis

Q18. Which commonly prescribed class of drugs is increasingly recognized as a cause of acute interstitial nephritis (AIN)?

• Proton pump inhibitors (PPIs)
• Beta blockers
• Topical corticosteroids
• Oral iron supplements

Correct Answer: Proton pump inhibitors (PPIs)

Q19. Which of the following clinical scenarios is an accepted indication for initiating urgent dialysis in severe drug-induced renal failure?

• Asymptomatic mild rise in serum creatinine only
• Refractory hyperkalemia with ECG changes despite medical therapy
• Isolated mild metabolic alkalosis
• Stable oliguric renal failure with no uremic symptoms

Correct Answer: Refractory hyperkalemia with ECG changes despite medical therapy

Q20. Which preventive approach is most important to reduce risk of acyclovir-associated crystal nephropathy during intravenous therapy?

• Rapid bolus administration to minimize exposure time
• Adequate intravenous hydration and slow infusion of acyclovir
• Co-administration with high-dose NSAIDs
• Give acyclovir only with loop diuretics

Correct Answer: Adequate intravenous hydration and slow infusion of acyclovir

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