Intravenous perampanel in clinical practice: A multicenter prospective registry study

Abstract

Purpose

This study aimed to evaluate the efficacy and safety of intravenous perampanel (IV-PER) in routine clinical practice.

Methods

Patients who received IV-PER at Nagoya University Hospital or one of the 21 affiliated institutions between June 2024 and March 2025 were included. Indications for IV-PER included treatment for epileptic seizures, particularly acute symptomatic seizures, and prophylactic use before or after surgery. The primary endpoint was the seizure suppression rate within 7 days of treatment initiation, and the secondary endpoint was the incidence of adverse events (AEs). Clinical data were recorded daily, and blood tests were conducted within 2 weeks of administration. Enrolled patients were categorized into three groups based on the underlying etiology: cerebrovascular disease (CD), brain tumor (BT), and traumatic brain injury (TBI). Treatment efficacy and safety were assessed across these groups.

Results

Of the 237 patients, 74, 116, and 47 were classified into the CD, BT, and TBI groups, respectively. The overall seizure suppression rate within 7 days was 89.0 %. Rates by group were 87.8 % (CD), 96.6 % (BT), and 72.3 % (TBI). When stratified by indication, the rates were 99.3 % for prophylactic use, 69.4 % for focal seizures, and 74.4 % for generalized seizures. Regarding AEs, somnolence was reported in 3 patients and irritability in one. Laboratory abnormalities included anemia, elevated liver enzymes, elevated creatine kinase, and hyponatremia. A total of 71 patients experienced one of these.

Conclusions

This large multicenter prospective registry demonstrates that IV-PER can be safely used for seizure management during the 7-day acute phase in real-world clinical settings.