Adderall is a prescription medication that contains a combination of two stimulant drugs: amphetamine and dextroamphetamine. These active ingredients belong to a class of medications known as central nervous system (CNS) stimulants, which affect chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Adderall is most commonly prescribed for the treatment of Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy, a chronic sleep disorder.