Adderall is a prescription medication used to treat attention-deficit/hyperactivity disorder (ADHD) and narcolepsy. It is a stimulant that affects the chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Adderall is a combination of two central nervous system stimulants, amphetamine and dextroamphetamine. It works by increasing the levels of dopamine and norepinephrine in the brain, which can help improve focus, attention, and alertness.