Varenicline-associated acute renal failure

Area of Science:

• Nephrology
• Pharmacology
• Public Health

Background:

• Varenicline is a widely used medication for smoking cessation.
• While generally safe, potential adverse effects require ongoing investigation.
• Patients with renal impairment may have altered drug metabolism and excretion.

Observation:

• A case of acute renal failure in a patient with moderate renal insufficiency who initiated varenicline therapy.
• The patient's renal function significantly improved after varenicline discontinuation.
• Diagnostic workup ruled out other common causes of acute kidney injury.

Findings:

• A temporal association was observed between varenicline initiation and the onset of acute renal failure.
• The Naranjo probability scale indicated varenicline as the probable cause of renal dysfunction.
• This case represents the first published report linking varenicline to acute renal effects.

Implications:

• Clinicians should exercise caution when prescribing varenicline to patients with pre-existing kidney disease.
• Monitoring renal function is recommended upon initiation of varenicline therapy.
• Despite this rare risk, the benefits of smoking cessation often outweigh potential adverse effects.