Safety and Tolerability Trial of Lumateperone in Pediatric Patients With Schizophrenia, Bipolar Disorder or Autism Spectrum Disorder

Inclusion Criteria: * Able to provide consent as follows: * The patient's legally authorized representative (LAR) (eg, parent or guardian) must provide written, informed consent; * The patient must provide written assent to study enrollment; * Male or female patients aged 13 to 17 years (inclusive) with schizophrenia; male or female patients aged 10 to 17 years (inclusive) with bipolar I or II disorder; or male or female patients aged 5 to 17 years (inclusive) with autism spectrum disorder; * Meet Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition Text Revision (DSM-5-TR) primary diagnosis of schizophrenia, bipolar I or II disorder, or autism spectrum disorder as confirmed by Kiddie Schedule for Affective Disorders and Schizophrenia for School-Age Children-Present and Lifetime Version (K-SADS-PL). * Is currently an outpatient and is anticipated to maintain outpatient status for the duration of the study. Rollover Patients entering from the lead-in study must have safely completed the lead-in study, in the opinion of the Investigator. Exclusion Criteria: * Has a primary psychiatric diagnosis other than schizophrenia, bipolar I or bipolar II disorder or autism spectrum disorder. Schizophrenia with catatonia, or bipolar disorder with psychotic features are not allowed. Exceptions include: * ADHD: If a subject is taking psychostimulant(s) for ADHD, they must have been on a stable treatment regimen of these medication(s) for 30 days prior to Screening…