Adderall XR is a prescription medication commonly used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. It is a central nervous system stimulant that contains a combination of two active ingredients: amphetamine and dextroamphetamine. Adderall XR is an extended-release formulation, meaning it releases the medication slowly over an extended period of time, typically lasting around 8-12 hours. This extended release helps maintain a more stable and consistent level of the medication in the bloodstream, reducing the need for multiple daily doses.