Approximately 10 million adults have attention-deficit/hyperactivity disorder (ADHD). Daytrana; Metadate CD; and the amphetamines, Adderall XR and Vyvanse. and may also reduce problems of “rebound” when the earlier dose wears off. Does ADHD medication rebound mean the dose is too high for your child? An expert answers, as well as gives tips for how you can blunt its effects.