Adderall 30mg is used to treat attention deficit-hyperactivity disorder (ADHD).It 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. This medication is typically taken once per day and lasts throughout the day, but it's common to have trouble sleeping and a loss of appetite. It's a controlled substance because of its high risk of misuse and dependency.