Adderall XR 15 mg is a prescription medicine widely utilized in the treatment of ADHD and narcolepsy that comes in the form of a stimulant. 15mg Adderall XR is labeled a moderate dose of Adderall prescribed for patients requiring constant symptom control without necessitating more than one dose per day. The ‘XR’ stands for extended-release, basically this capsule is designed to provide fast release of medication throughout the day and usually lasts up to 8 to 12 hours. Most doctors prescribe Adderall XR 15 blue and white to improve focus, reduce hyperactivity, and enhance impulse control in children, adolescents, and adults.