Adderall is available in a regular-release variety that lasts 4 to 6 hrs and an prolonged-release kind (Adderall XR) that actually works for approximately twelve hrs. Brand name-title Adderall XR and generic Adderall and Adderall XR can be obtained as amphetamine/dextroamphetamine and prolonged-release amphetamine/dextroamphetamine. Referring to