"my experience is limited since i have only been on this medication for a few days.  i am a medical resident, diagnosed with adhd at 32. got sick and tired of my mediocre performance at work. tried straterra, viibryd and wellbutrin, nothing worked. just started on dexedrine 5mg 2-3 times a day. my first day on it, i studied all day until midnight. i was so motivated, i felt great, on top of the world, i was so driven. i noticed an immediate difference in my performance at work and it made me a nicer, less cynical. the bad thing was insomnia, teeth clenching, some nausea, decreased appetite and the drop in my mood once it wore off. i am worried about intolerance which is driving up my anxiety level. "