I've been on Adderall xr 15mg for over a year. It helps some but i could be better. my doc just put me on 20 mg xr reCently, and it is not working as well as the lesser dose! ? How can that be? And how can i tell my doctor without sounding like a nut? Has anyone had experience wIth name brand verses generic? I don't want to suggest this without hearing from Others because doctors are always convinced that there is no difference for some reason.