Probable levetiracetam-associated depression in the elderly: two case reports.

BACKGROUND

Compared with traditional antiepileptic drugs, levetiracetam has a unique mechanism of action and unique properties, including predominant renal excretion and lack of drug-drug interactions. In the elderly, depression associated with levetiracetam has not been reported.

CASE SUMMARIES

A 73-year-old black man (height, 172.7 cm; weight, 92.7 kg; body mass index [BMI], 31 kg/m(2)) with stage 4 kidney disease was taking levetiracetam 500 mg BID for partial complex seizures. After 5 months of taking medication, new-onset depression, evidenced by depressed mood, weight loss, fatigue, and appearing withdrawn, was noted in this patient. Levetiracetam was discontinued by order of the patient's primary care physician. At a follow-up appointment 4 weeks later, the depressive symptoms had nearly resolved. The patient's Naranjo Adverse Drug Reaction Probability Scale score was 6, indicating levetiracetam to be a probable cause of depression in this patient. In a second case, a 92-year-old white woman (height, 154.9 cm; weight, 54.5 kg; BMI, 22.7 kg/m(2)) with existing chronic kidney disease and new-onset partial seizure, likely due to a meningioma, was initiated on levetiracetam 500 mg once daily. Depressive symptoms (eg, anhedonia, hypersomnolence, decreased appetite) were noted within 5 weeks. Cessation led to improvement in mood and cognition within 8 days. Based on this patient's Naranjo Adverse Drug Reaction Probability Scale score of 6, levetiracetam was a probable cause of depression in this patient.

CONCLUSIONS

Levetiracetam was a probable cause of depression in these 2 elderly patients. Cautious use and additional monitoring may be necessary when prescribing levetiracetam to elderly patients, especially when prescribing to those with a history of renal impairment.