A Phase 2, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study to Assess the Efficacy, Safety, and Pharmacokinetics of NBI-1117568 in Adults With Bipolar I Disorder Who Are Currently Experiencing a Manic Episode or Manic Episode With Mixed Features, With or Without Psychotic Symptoms, and Warrant Inpatient Hospitalization

Key Inclusion Criteria: * Participant has a primary diagnosis of bipolar I disorder. * The participant has had at least 1 prior documented manic episode that required treatment. * The participant is experiencing an acute manic episode or manic episode with mixed features, with or without psychotic symptoms. Key Exclusion Criteria: * Any unstable or poorly controlled medical condition or chronic disease (including history of neurological, hepatic, renal, cardiovascular, gastrointestinal, pulmonary, autoimmune, or endocrine disease that may affect study participation or results), or malignanc…