Trends in Antiseizure Medication Prescribing Among Nursing Home Residents With and Without a Seizure Diagnosis

Objectives:Evaluate current prevalence and changes in prescribing of antiseizure medications (ASMs) in Virginia nursing homes for residents with and without seizures.Methods:Retrospective cohort. De-identified claims extracted from the Virginia All-Payers-Claims-Database defined annual and biennial cohorts of all insured long-stay residents with and without any claims-based seizure diagnoses. ASM prescribing prevalence rates for these cohorts were analyzed from 2011 to 2016. Multiple logistic regression compared prescribing prevalence rates within and between these 2 groups.Results:Annual cohorts averaged 57,190. 65.6% Female, 38% white. 80% public insurance, 20% commercial secondary. Between 2011 and 2016, the claims-based prevalence of seizure diagnoses decreased (17.1% to 10.5%). However, ASM prescribing prevalence increased (10.4% to 11.6%). Increases were entirely among residents who never had any seizure-epilepsy claim, whereas ASM prescribing among residents with seizures decreased. Different drugs were used for patients with and without seizures. For residents without seizures, 85% of ASMs prescribed have alternative indications for mood or pain symptoms, and large gains in gabapentin and modest but significant increases in valproate, lamotrigine, carbamazepine, and topiramate prescribing were detected. Among residents with seizures, ASMs without alternative indications were more common (59%), with marked reductions in phenobarbital and phenytoin but significant increases in levetiracetam and lacosamide use observed.Conclusions:Long-stay ASM use is changing. ASM gains are unrelated to seizure-epilepsy prevalence. ASM prescribing increased only among residents without seizures, where ASMs with expanded indications were preferred. Long-stay ASM prescribing and prescribing indication should be included in mandatory CMS reporting similar to other CNS-active medications.