Adderall also can be considered a nootropic, a drug that improves mental functioning and alertness.
In the United States, the mixture was approved with a New Drug Application (NDA) by the FDA in 1960. The extended release version was approved in 2001. A generic version (not extended release) was approved with a Abbreviated New Drug Application (ANDA) in 2002.
The time to reach maximum plasma concentration is:
- Adderall XR® is about 7 hours
- Addreall 3 hours
Adderall XR 20 mg one daily has similar pharmacokinetics to Adderall(immediate-release) 10 mg twice dialy administered 4 hours apart. 
The mean elimination half-life in adults for d-amphetamine is 10 hours and for the l-amphetamine is 13 hours
Drug abuse and control
As an amphetamine, although somewhat less likely to be abused than those that reach a peak level more quickly, it is in the most tightly regulated group of prescription drugs. In the U.S., that is Schedule II of the Drug Enforcement Administration.
The most up-to-date information about Adderall and other drugs can be found at the following sites.
- Adderall - FDA approved drug information (drug label) from DailyMed (U.S. National Library of Medicine).
- Adderall - Drug information for consumers from MedlinePlus (U.S. National Library of Medicine).
- Adderall - Detailed information from DrugBank.