Generic Adderall XR 20 mg is the most common prescribing dose of Adderall to treat ADHD and also narcolepsy. Adderall 20 mg XR is specifically designed to be effective for 8 to 12 hours, mitigating symptoms with one morning dose. Adderall XR 20mg orange capsule is made of two amphetamine salts which cause the brain to have higher levels of neurotransmitters, which play a significant role in focusing, reducing hyperactivity and improving concentration while taking Adderall. The 20 mg dose is seen as a medication alleviating strength, and is often prescribed when lower doses do not adequately treat the symptoms exhibited by the patient.