Long-term Safety and Efficacy of Adjunctive Brivaracetam in Chinese Patients With Uncontrolled Focal Epilepsy

An Open-Label, Multicenter, Long-Term Follow-Up Study to Evaluate the Safety and Sustained Efficacy of Adjunctive Brivaracetam Tablets in Chinese Patients With Uncontrolled Focal Epilepsy

This is a multicenter, open-label, single-arm, long-term follow-up trial designed to evaluate the long-term safety of adjunctive brivaracetam 200 mg/day (100 mg twice daily) in patients with partial-onset seizures. Secondary objectives include assessing the sustained efficacy of long-term brivaracetam treatment.

Subjects who completed the 12-week maintenance phase of the preceding QF-Brivaracetam-POS-301 trial (regardless of prior treatment assignment to brivaracetam or placebo) are eligible to enroll, provided they are deemed to benefit from extended treatment, have not experienced intolerable drug-related adverse events, and are willing to continue brivaracetam therapy. All enrolled patients will receive open-label brivaracetam 200 mg/day (100 mg twice daily). Dose adjustments are permitted based on seizure control and tolerability, with a maximum dose of 200 mg/day. Concomitant antiepileptic drugs (AEDs) are allowed, including dose adjustments, initiation of new AEDs, or discontinuation of existing AEDs.

The trial consists of four phases: a 1-week screening/lead-in phase, an extended treatment period, a 3-week dose tapering phase, and a 30-day safety follow-up period. During the extended treatment phase, study visits occur at Weeks 4, 12, 24, 36, and 52, followed by in-person visits every 6 months and telephone visits every 3 months thereafter. Unscheduled visits are allowed for adverse events or worsening seizure control. The dose tapering phase, which is optional, involves gradual discontinuation of brivaracetam over 3 weeks, or adjusted per the investigator's clinical judgment. The safety follow-up phase occurs 30 days after the last dose of study drug.

Study Overview

• Status: Completed
• Conditions: Epilepsy, Focal
• Intervention / Treatment: Drug: Brivaracetam

Detailed Description

Background and Rationale： Epilepsy is a neurological disorder characterized by recurrent, unprovoked seizures resulting from abnormal, excessive, or synchronous neuronal activity in the brain. Clinical manifestations include myoclonus, sudden interruption of psychomotor activity, loss of consciousness, sensory abnormalities, and emotional or psychomotor disturbances. In severe cases, sudden loss of consciousness with tonic-clonic convulsions may occur, accompanied by screaming, cyanosis, foaming at the mouth, and pupillary dilation. Status epilepticus, characterized by continuous seizure activity, can be life-threatening.

Brivaracetam tablets are a derivative of the second-generation antiepileptic drug levetiracetam, with a propyl group attached to the 4-position carbon of the pyrrolidine ring. Brivaracetam exerts its antiepileptic effect by binding to synaptic vesicle protein 2A (SV2A) in presynaptic nerve terminals, with 15 to 30 times higher affinity than levetiracetam. Its favorable lipophilicity enables efficient blood-brain barrier penetration, significantly enhancing antiepileptic activity. Brivaracetam demonstrates high bioavailability, rapid oral absorption, and favorable pharmacokinetic and safety profiles. Its excellent central nervous system tolerability represents a key advantage over other antiepileptic drugs.

Study Rationale： This extension study is designed to evaluate the long-term safety and sustained efficacy of adjunctive brivaracetam in Chinese patients with uncontrolled focal epilepsy who have completed the preceding QF-Brivaracetam-POS-301 trial. Eligible subjects are those who, in the investigator's judgment, may benefit from continued brivaracetam treatment, have not experienced intolerable drug-related adverse events, and are willing to continue brivaracetam therapy during the extension phase.

• Study Type: Interventional
• Enrollment (Actual): 141
• Phase: Phase 3

Contacts and Locations

Study Locations

• China
  • Shanghai Municipality
    • Shanghai, Shanghai Municipality, China, 200040
      • Huashan Hospital, Fudan University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Able to understand and voluntarily sign the written informed consent form for this extension trial.
• Considered reliable by the investigator and capable of complying with the study protocol, including completing seizure diaries, attending study visits, and adhering to treatment.
• Completed the 12-week double-blind maintenance treatment period of the preceding QF-Brivaracetam-POS-301 trial.
• Judged by the investigator to be likely to benefit from long-term treatment with brivaracetam.
• Female subjects of childbearing potential must have a negative pregnancy test within 7 days prior to the first study drug administration and agree to use a medically acceptable method of contraception during the trial and for 3 months after the last dose of study drug. Male subjects with partners of childbearing potential must agree to use effective contraception during the trial and for 3 months after the last dose of study drug.

Exclusion Criteria:

• Known hypersensitivity to brivaracetam, levetiracetam, or other pyrrolidine derivatives; or history of multiple severe allergies.
• Any medical or psychiatric condition that, in the investigator's opinion, may jeopardize or impair the subject's ability to participate in the trial; or clinically significant abnormal laboratory values including: calculated CrCL < 30 mL/min (Cockcroft-Gault formula), platelets < 80×10^9/L, neutrophils < 1.8×10^9/L, ALT/AST/ALP > 2×ULN, or GGT > 3×ULN.
• QTc interval > 450 ms on 12-lead ECG, confirmed by repeat testing (average of 3 measurements remains > 450 ms).
• Female subjects who are pregnant or breastfeeding.
• History of suicide attempts (including actual attempts, interrupted attempts, aborted attempts, or preparatory acts/behavior) or current suicidal ideation, as assessed by the C-SSRS scale.
• Any other condition that, in the investigator's judgment, makes the subject unsuitable for participation in this trial.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Brivaracetam Extended Treatment Arm; All enrolled subjects receive open-label brivaracetam tablets as extended treatment. The initial dose is 200 mg/day (100 mg twice daily, oral administration). Dose adjustments are allowed based on seizure control and tolerability, with a maximum dose not exceeding 200 mg/day. Concomitant antiepileptic drugs are permitted, including dose adjustments, initiation of new AEDs, or discontinuation of existing AEDs.

Drug: Brivaracetam; Brivaracetam tablets, oral administration, initial dose 200 mg/day (100 mg twice daily). Dose adjustments are allowed based on clinical response and tolerability, with a maximum dose not exceeding 200 mg/day.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Treatment Emergent Adverse Event (TEAE) Incidence Rate	Proportion of subjects with at least one treatment-emergent adverse event (TEAE) during	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years
Subject Discontinuation Rate Due to Adverse Events (AEs)	Proportion of subjects who permanently discontinue study treatment due to an adverse event	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years
Serious Adverse Event (SAE) Incidence Rate	Proportion of subjects who experience at least one serious adverse event (SAE) during the extended treatment period	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Partial-Onset Seizure (POS, Type 1) Frequency per 28 Days	Partial-onset seizure frequency per 28 days, calculated as (total number of partial-onset seizures) / (number of non-missing seizure diary days during treatment) × 28.	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years
Change in Partial-Onset Seizure (POS, Type 1) Frequency per 28 Days	Change from baseline in partial-onset seizure frequency per 28 days, calculated as (baseline value - value at each assessment window) / baseline value × 100%	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years
Responder Rates (50%, 75%, 90%) for Partial-Onset Seizure (POS, Type 1) Frequency	Proportion of subjects with ≥50%, ≥75%, and ≥90% reduction in partial-onset seizure frequency compared to the baseline period of the preceding QF-Brivaracetam-POS-301 trial	baseline,Weeks 4, 12, 24, 36, 52, and up to 2years

Collaborators and Investigators

• Sponsor: Jiangxi Qingfeng Pharmaceutical Co. Ltd.
• Investigators: Principal Investigator: Zhen Hong, MD, Huashan Hospital

Study record dates

Study Major Dates

• Study Start (Actual): February 7, 2021
• Primary Completion (Actual): May 21, 2024
• Study Completion (Actual): April 29, 2025

Study Registration Dates

• First Submitted: April 17, 2026
• First Submitted That Met QC Criteria: April 29, 2026
• First Posted (Actual): May 4, 2026

Study Record Updates

• Last Update Posted (Actual): May 4, 2026
• Last Update Submitted That Met QC Criteria: April 29, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Epilepsy; Epilepsies, Partial; brivaracetam
• Other Study ID Numbers: QF-Brivaracetam-POS-302

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No