Impact of Combined Medication and Behavioral Treatment for ASD & ADHD

Study drug will be administered in the morning. Treatment will be initiated at 1 tablet = 3.1 mg or 0 mg of mixed amphetamine. Doses will be flexibly titrated upward and may be decreased or stopped at any time.

All participants will receive 8 weekly parent child therapy sessions will be delivered by a therapist trained in parent coaching and ESDM principles and strategies and utilizing a therapy manual,(includes coaching for behavior management and handouts).

Matched placebo tablets will be administered in the morning and provided for 11 weeks . The tablets will be titrated in the same way as the active drug and may be stopped at any time.