The purpose of the study is to evaluate the long-term safety and tolerability of brivaracetam.

EP0156 is designed to assess the long-term safety and tolerability of BRV in pediatric study participants with epilepsy who participated in the neonatal study N01349 [NCG03325439] and/or have participated in the open-label, long-term, follow-up pediatric study N01266 [NCT01364597]. EP0156 will also assess the long-term safety and tolerability of BRV in Japanese pediatric study participants with partial-onset seizures who will be directly enrolled into the study in Japan. Pharmacokinetic data will also be evaluated in Japanese study participants.

Inclusion Criteria:

Inclusion criteria for long-term follow-up (LTFU) study participants only

• Study participants ≥ 1 month of age with a confirmed diagnosis of epilepsy who participated in core study N01266 [NCT01364597] and/or N01349 [NCT03325439]

Inclusion criteria for directly enrolled (DE) study participants in Japan only

• Study participant is ≥ 4 years to < 16 years of age
• Study participant has presence of an electroencephalogram (EEG) reading compatible with the diagnosis of focal epilepsy within the last 10 years
• Study participant has uncontrolled partial-onset seizure (POS) after an adequate course of treatment with at least 1 antiepileptic drug (AED)
• Study participant had at least 1 POS during the 4-week Screening Period

Exclusion Criteria:

Exclusion criteria for all study participants

• Severe medical, neurological, or psychiatric disorders or laboratory values, which may have an impact on the safety of the study participant
• Study participant is currently participating in another study of an investigational medication (or a medical device) other than brivaracetam (BRV).

Exclusion criteria for long-term follow-up (LTFU) study participants only

- Study participant ≥ 6 years of age has a lifetime history of suicide attempt or has suicidal ideation in the past 6 months as indicated on the Columbia Suicide Severity Rating Scale (C-SSRS)

Exclusion criteria for directly enrolled (DE) study participants in Japan only

• Study participant has a history of primary generalized epilepsy, psychogenic non-epileptic seizures, or febrile seizures
• Study participant has a history of status epilepticus in the 30 days prior to the Screening Visit (ScrV) or during the Screening Period
• Study participant has any clinically significant illness
• Study participant has clinically significant laboratory abnormality that may increase the risk associated with study participation or may interfere with the interpretation of study results
• Study participant has a clinically significant ECG abnormality
• Study participant had major surgery within 6 months prior to the ScrV

Data from this trial may be requested by qualified researchers six months after product approval in the US and/or Europe, or global development is discontinued, and 18 months after trial completion. Investigators may request access to anonymized individual patient-level data and redacted trial documents which may include: analysis-ready datasets, study protocol, annotated case report form, statistical analysis plan, dataset specifications, and clinical study report. Prior to use of the data, proposals need to be approved by an independent review panel at www.Vivli.org and a signed data sharing agreement will need to be executed. All documents are available in English only, for a prespecified time, typically 12 months, on a password protected portal. This plan may change if the risk of re-identifying trial participants is determined to be too high after the trial is completed; in this case and to protect participants, individual patient-level data would not be made available.

Data from this trial may be requested by qualified researchers six months after product approval in the US and/or Europe or global development is discontinued, and 18 months after trial completion.

Qualified researchers may request access to anonymized IPD and redacted study documents which may include: raw datasets, analysis-ready datasets, study protocol, blank case report form, annotated case report form, statistical analysis plan, dataset specifications, and clinical study report. Prior to use of the data, proposals need to be approved by an independent review panel at www.Vivli.org and a signed data sharing agreement will need to be executed.All documents are available in English only, for a pre-specified time, typically 12 months, on a password protected portal.