Levetiracetam – Renal Dose Adjustment — SCE Neurology MCQ

Instant feedback + full explanation. One question, done properly.

ModerateEpilepsy & Seizure DisordersLevetiracetam – Renal Dose AdjustmentSCE Neurology

A 55-year-old woman with epilepsy and chronic kidney disease (eGFR 25 mL/min) needs an antiseizure medication for focal seizures. Which AED requires the most significant dose reduction in renal impairment?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — Levetiracetam

Levetiracetam is primarily renally excreted (66% unchanged in urine) and requires significant dose reduction in renal impairment. The BNF recommends reducing both the dose and the dosing interval based on creatinine clearance. In contrast, lamotrigine, carbamazepine, phenytoin, and valproate are primarily hepatically metabolised and do not require renal dose adjustment (though some metabolites are renally cleared). A: Lamotrigine is hepatically metabolised (glucuronidation). B: Carbamazepine is hepatically metabolised (CYP3A4). D: Phenytoin is hepatically metabolised (CYP2C9/19). E: Valproate is hepatically metabolised.

Reference: BNF – Renal Dosing Adjustments; NICE NG217 (2025)