Inclusion Criteria:  Age 12 to 45 at screening Has a designated care/study partner who can reliably report on symptoms Has a diagnosis of Autism Spectrum Disorder (ASD) Full scale IQ (or equivalent) ≥70 score Psychoactive medications and adjunctive therapies are stable for 4 weeks prior to screening Must be able to swallow study medication  Exclusion Criteria:  Has Rett syndrome or Child Disintegrative Disorder Has participated in any other study and received any other investigational medication (other than COVID-19 vaccination) or device within 60 days prior to screening History of epilepsy without current adequate control, or any seizure in the 6 months preceding screening History of suicidal ideation or behavior in the past 12 months, or a positive response to C-SSRS questions 4 and/or 5 Systolic blood pressure ≥160 mmHg, or diastolic blood pressure ≥100, or a clinical history of uncontrolled or severe hypertension If female, is pregnant or lactating