Adderall XR 20 mg is a well-known brand and generally identified as having an orange oblong shape (17mm) & it is a prescription medication approved for the treatment of ADHD. It is a combination of amphetamine salts formulated to work on the brain to improve focus on tasks and reduce hyperactivity. Amphetamine Dextroamphet ER 20 mg is a common prescription strength for many individuals who do not respond well to the lower dose.