Buy Adderall XR 30mg, a powerful, prolonged release capsule that is commonly given for narcolepsy and ADHD. Depending on individual metabolic rates, the capsule's slow release of mixed amphetamine salts lasts anywhere from 12 to 24 hours. Because Adderall XR 30mg pills are designed to increase attention and alertness throughout the day, patients are advised to take them exactly as prescribed.