I saw my doctor yesterday about my Vyvanse barely working(even with dose adjustment) and he said he has never had this happen or even heard of it. So he prescribed me Concerta. It has been absolutely horrible, my focus is worse, hallucinations(auditory), headaches, etc. My doctor didn't want to prescribe me anything with an Amphetamine, he believes if one stops working, they all do. My question is if that's true, and that even though Vyvanse barely works for me now, would that mean things like Adderall wouldn't work either(since both active ingredients are Lisdexamphetamine)?