A Study to Test the Efficacy and Safety of Padsevonil as Treatment of Focal-onset Seizures in Adult Subjects With Drug-resistant Epilepsy

Change in Log-transformed Observable Focal-onset Seizure Frequency From Baseline Over the 12-week Maintenance Period

During the study, participants kept diaries to record daily seizure activity. Seizure frequency refers to 28-day adjusted frequency. Seizure frequency was based on investigator assessment of participants' reports of daily seizure type and frequency. Observable focal-onset seizures refer to Type IA1, IB, and IC (ILAE Classification of Epileptic Seizures, 1981). Based on ANCOVA on change in log-transformed seizure frequency from Baseline, with treatment group as the main factor, Baseline log-transformed seizure frequency as a continuous covariate, Baseline SV2A use (Yes or No) and Region (Europe, non-Europe) as categorical factors.

Time frame: From Baseline over the 12 Week Maintenance Period (up to Week 16)

Percentage of Participants With Treatment-Emergent Adverse Events (TEAEs)

An Adverse Event is any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product that does not necessarily have a causal relationship with this treatment. A TEAE was defined as any event not present before the initiation of the first dose of study treatment or any unresolved event already present before initiation of the first dose that worsened in intensity following exposure to the treatment.

Time frame: From Baseline until Safety Follow-Up (up to Week 23)

Percentage of Participants With Treatment-Emergent Adverse Events (TEAEs) Leading to Study Withdrawal

An Adverse Event is any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product that does not necessarily have a causal relationship with this treatment. A TEAE was defined as any event not present before the initiation of the first dose of study treatment or any unresolved event already present before initiation of the first dose that worsened in intensity following exposure to the treatment.

Time frame: From Baseline until Safety Follow-Up (up to Week 23)

Percentage of Participants With Treatment-Emergent Serious Adverse Events (SAEs)

A Serious Adverse Event (SAE) is any untoward medical occurrence that at any dose: Results in death, is life-threatening, requires in patient hospitalization or prolongation of existing hospitalization, is a congenital anomaly or birth defect, is as infection that requires treatment parenteral antibiotics, other important medical events which based on medical or scientific judgement may jeopardize the patients, or may require medical or surgical intervention to prevent any of the above. A TEAE was defined as any event not present before the initiation of the first dose of study treatment or any unresolved event already present before initiation of the first dose that worsened in intensity following exposure to the treatment.