Adderall is a prescription medicine that helps treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. Amphetamine and dextroamphetamine are the active ingredients in Adderall. Adderall is related to a class of medications called stimulants. It comes in two forms: Adderall oral tablet and Adderall XR extended-release oral capsule. If you want to buy adderall online cheaply, make sure to buy it from a trusted pharmacy.