Follow-Up:
On further research I have discovered that Adderall was originally marketted as a weighloss medication called Obetrol. By the way, Adderall is now available as Adderall XR a time release formula. It comes in 10, 20, and 30 mgs. If you take 5 mgs of the regular Adderall twice a day you can probably take one 10 mg Adderall XR which releases 5 mgs immediately and then another 5 mgs about 4 hours later. If you would like further information you can talk with a doctor or nurse at Shire US (The makers of Adderall and Adderal XR) at 1-(800)-536-7878. And no, I don't have stock in the company. I'm just a relatively satisfied user.