Brivaracetam-associated manic episode in a patient with bipolar disorder: A case report.

Background: Levetiracetam and brivaracetam (BRV) are antiseizure medications that exert effects by binding to synaptic vesicle protein 2A (SV2A). BRV exhibits higher affinity and selectivity for SV2A and is generally considered to have a favorable psychiatric tolerability profile. However, reports on serious psychiatric adverse events remain scarce. Case Presentation: We herein report a 60-year-old man with a history of bipolar disorder who had remained psychiatrically stable for many years under aripiprazole treatment. He was diagnosed with focal epilepsy based on stereotyped focal seizures with impaired awareness and right temporal epileptiform discharges observed on electroencephalography. BRV was initiated at a dose of 50 mg/day and later increased to 100 mg/day. Several weeks after initiation, he developed elevated mood, marked irritability, emotional dysregulation, and delusion-like ideation, progressing to a manic episode with psychotic features requiring inpatient psychiatric care. BRV was discontinued and replaced with lacosamide, coupled with intensification of a mood-stabilizing treatment, which resulted in the gradual resolution of manic symptoms. No epileptic seizures occurred during BRV treatment or after the medication switch. Conclusion: This case suggests that, despite its generally favorable psychiatric tolerability, BRV may be associated with the emergence of symptoms in patients with bipolar disorder. These findings highlight the importance of careful psychiatric risk assessment and close monitoring when initiating BRV in individuals with underlying mood vulnerability.