Buy Adderall XR 30 mg online. It is a prescription drug and is a combination medication indicated for attention deficit and hyperactivity disorder (ADHD) and narcolepsy. It is a combination drug containing 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 stimulants that work in the brain and effectively manage the symptoms of ADHD and narcolepsy.