What is Adderall? Buy Adderall 20 mg online is a prescription drug and is a combination medication indicated for Attention deficit and hyperactivity disorder (ADHD) and Narcolepsy. This drug contains four salts of amphetamine. The mixture comprises equal parts of racemic amphetamine and dextroamphetamine in a ( 3:1) ratio. It belongs to the class of drugs called stimulant that works in the brain and effectively manages the symptoms of ADHD and Narcolepsy.