Adderall is a prescription stimulant commonly used to treat Attention Deficit Hyperactivity Disorder (ADHD) and narcolepsy. It contains a combination of amphetamine and dextroamphetamine, which work by increasing the levels of certain chemicals in the brain to improve focus, attention, and impulse control. Adderall is known for its effectiveness in enhancing concentration, but it can also lead to side effects like increased heart rate, insomnia, and anxiety.