I know exactly how you feel. When I first started taking adderall it seemed to work really well but quite quickly I felt like it was wearing off too soon. Then I switched to 30mg XR twice a day which was a little better but I still dont feel as productive as I did when I first starting on adderall. I wish I had a solution for you but something someone told me might help. She said to stay away from acidic foods a drinks when you first take it because they can effect how long it works. admittedly I forget alot but have noticed some difference when I remember to watch the acid intake till Im sure the adderall is digested.