Adderall XR is a once-daily, timed-release stimulant ADHD medication primarily used to treat attention deficit hyperactivity disorder (ADHD or ADD) in children ages 6-12, adolescents, and adults. It has not been studied in children under the age of 6. According to the FDA, Adderall XR is a federally controlled substance (“Schedule II Stimulant”) because it can be abused or lead to dependence. It is an amphetamine.