Which drug requires dose reduction when CrCl ≤ 80 mL/min?

• A. Levetiracetam
• B. Lisinopril
• C. Simvastatin
• D. Azithromycin

Answer: (A)

Renal clearance drives how we adjust drug dosing. When kidney function declines, drugs that are mainly excreted unchanged by the kidneys can accumulate unless the dose or dosing interval is adjusted. Levetiracetam fits this pattern because it is cleared almost entirely by the kidneys with minimal metabolism. As CrCl decreases to 80 mL/min or less, the drug’s elimination slows, so reducing the dose (or extending dosing intervals) helps prevent toxicity while maintaining seizure control.

The other drugs listed are not typically managed with a dose reduction at this CrCl threshold. Lisinopril is renally cleared as well, but dose adjustments are generally tied to more significant reductions in function (lower CrCl values); simvastatin is primarily hepatically cleared and is not dose-adjusted for renal impairment in the same way; azithromycin is largely hepatically cleared with no routine CrCl-based dose reduction for mild-to-moderate impairment. Thus, levetiracetam is the one most consistently requiring a dose adjustment when CrCl is as low as 80 mL/min.