Adderall is a prescription medication containing mixed amphetamine salts. It is primarily used to treat attention-deficit/hyperactivity disorder (ADHD) and, in some cases, narcolepsy. It works by increasing the activity of certain neurotransmitters, including dopamine and norepinephrine, in the brain. Adderall may help improve attention, focus, and impulse control in people with ADHD when used as prescribed. However, it can also cause side effects such as decreased appetite, difficulty sleeping, dry mouth, headache, increased heart rate, and anxiety.