Adderall is the trade or brand name for a combination of four different salts of amphetamines. You can buy Adderall online as a brand name and generic medication to help treat ADHD and narcolepsy. It contains a mixture of equal parts of racemic amphetamine and dextroamphetamine, two enantiomers of the amphetamines. Both of them are stimulants of the brain but work in different manners to produce the effects of Adderall.