Amphetamine and dextroamphetamine are combined in the stimulant Adderall. These two ingredients working in the central nervous system affect the brain and nerve substances that cause restlessness and control of impulses. Narcolepsy along with attention deficit hyperactivity disorder (ADHD) are conditions that are managed using Adderall. The highly improving active substance in our body taking of Adderall, within 30 minutes.