Adderall 20mg is a prescription stimulant that contains a combination of amphetamine and dextroamphetamine. It is commonly used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy by increasing dopamine and norepinephrine levels in the brain. This helps improve focus, attention, and impulse control. Adderall 20mg is available in both immediate-release (IR) and extended-release (XR) formulations. The IR version typically lasts 4-6 hours, while the XR version provides effects for up to 12 hours.