Primary Generalized Tonic-Clonic Seizures

The purpose of this study is to determine the safety of Fycompa for injection after administration in participants with epilepsy (partial-onset seizures \[including secondarily generalized seizures\]) (age 4 years or older) or primary generalized tonic-clonic seizures (age 12 years or older).

This is a Phase 3, multicenter, randomized, double-blind, placebo-controlled study to evaluate the clinical efficacy, safety, and tolerability of XEN1101 administered as adjunctive treatment in primary generalized tonic-clonic seizures (PGTCS).