amfetamine

Vyvanse (Lisdexamfetamine dimesylate)is a new ADHD/ADD Medication developed by Shire, the same company that invented Adderall and Daytrana

Basically it is just a new gimic in order for Shire to be able to keep a steady cash flow when their patent on Adderall expires in 09.\r \r It is an d-amphetamine or commonly known as dextroamphetamine except bonded with an additional protien, lysine, creating Lisdextroamphetamine Dimesylate which Shire then shortened and replaced the "ph" with an "f" resulting with lisdexamfetamine, because they believe it would help customers psychologically disassociate its relationship with the illegal drug amphetamine..