A Study of KarXT + KarX-EC for Treatment of Irritability in Children and Adolescents With Autism Spectrum Disorder

Inclusion Criteria

* Participants must have a confirmed diagnosis of ASD, as defined by the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR) criteria, confirmed by the K-SADS-PL and must be experiencing symptoms of irritability.
* Participants must have an ABC-I ≥18 (Irritability subscale of the ABC) and CGIS specific to irritability ≥4, at screening and baseline (Day 1).

Exclusion Criteria

* Participants must not have a current primary DSM-5 diagnosis of bipolar disorder, including bipolar II disorder, schizophrenia, schizoaffective disorder, major depressive episode as determined by clinical instrument, or post-traumatic stress disorder (PTSD).
* Exception Include: Participants with comorbid ADHD, provided that attention deficit/hyperactivity disorder (ADHD) is not the primary disorder, the participant is adequately treated and based on the investigator judgment the disorder is clinically stable.
* Participants must not have history/presence of clinically significant disease or disorder that would jeopardize participant safety or validity of study results.
* Participants must not have a risk for suicidal behavior, and any clinically significant abnormal laboratory test.
* Other protocol-defined Inclusion/Exclusion criteria may apply.