Adderall is mostly used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy. It is a brand name, and it is a combination of amphetamine and dextroamphetamine. Using Adderall helps increase the ability to pay attention, focus, and control behavior. Adderall increases the activity of the brain chemicals dopamine and norepinephrine. Adderall is available in tablet and the extended-release capsule form known as Adderall XR, and the dosage of Adderall varies from 5mg to 30mg.