Adderall is available both as immediate-release and extended-release tablets for ADHD, Buy Adderall XR online where the initial dose of 5 mg is recommended orally up to 2 times a day. When it comes to extended-release tablets, the dosage is restricted to 20 mg once a day. For narcolepsy, the initial dosage is limited to 10 mg, where immediate release works faster to promote wakefulness.