Adderall XR 15 mg is an extended-release form of Adderall, its action being more prolonged than in the case of the immediate-release form. It contains amphetamine salts in combination that make a person with ADHD feel more focused and attentive, hence controlling impulses during the day. Adderall XR is used for symptomatic treatment of narcolepsy, abnormally distributed states of rest and activity, a symptom of which there is an exaggerated tendency to fall asleep during usual waking hours.