The primary purpose of this study is to assess the retention rate of perampanel as a reliable proxy for overall effectiveness and tolerability in participants aged at least 12 years who are prescribed perampanel (for partial onset seizures \[POS\] with or without secondary generalization \[SG\] or for primary generalized tonic-clonic seizures \[PGTCS\] associated with idiopathic generalized epilepsy \[IGE\] as first adjunctive to antiepileptic drug (AED) monotherapy as part of their routine clinical care.
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Retention Rate at Month 12
Timeframe: Month 12