A Randomized Study of Azetukalner Versus Placebo in Major Depressive Disorder (X-NOVA3)

Key Inclusion Criteria: * Adults ≥18 and ≤74 years of age and experienced their first major depressive episode (MDE) prior to 50 years of age * Body Mass Index (BMI) ≤40 kg/m2 * Meets the Diagnostic and Statistical Manual of Mental Disorders Fifth Edition Text Revised (DSM-5-TR) criteria for current major depressive disorder and is currently in an MDE, confirmed using the Mini International Neuropsychiatric Interview (MINI) * Participant's current MDE has a duration of ≥6 weeks and ≤24 months. Key Exclusion Criteria: * Participant has a primary diagnosis of a mood disorder other than MDD. * Participant has a history of any of the following: MDD with psychotic or catatonic features; MDD with mixed features; Bipolar I or II disorder; Obsessive-compulsive disorder; Schizophrenia, primary thought disorder, or other psychotic disorder. * Participant has a current diagnosis of any of the following: MDD with seasonal pattern; Depression with peripartum or perimenopausal onset; Post traumatic stress disorder; Antisocial or borderline personality disorder (or presence of clinically significant borderline personality traits); Panic disorder and/or agoraphobia; ADHD treated with a psychostimulant, diagnosed during the current MDE, or with unstable symptoms, as judged by the investigator. * Participant has a substance (excluding tobacco) or alcohol use disorder within the 12 months prior to screening. * Participant has had an active suicidal plan/intent within the 6 months prior to sc…