Adderall is a combination of amphetamine and dextroamphetamine, two central nervous stimulants that improve focus and reduce impulsivity by increasing dopamine and norepinephrine levels in the brain. The Food and Drug Administration (FDA) approved Adderall in 1996. Amphetamine/dextroamphetamine belongs to a class of drugs known as stimulants. It can help increase your ability to pay attention, stay focused on an activity, and control behavior problems. It may also help you to organize your tasks and improve listening skills. Adderall® tablets contain d-amphetamine and l-amphetamine salts in the ratio of 3:1.