I'm 31 and have been taking 20mg of adderall twice per day ending at noon. It has worked great for about 1 year but it makes me sweat and it seems to keep me up at night even though I take the last dose at noon. The dose is good because I can concentrate very good at work and throughout the day. I was wondering if the levo amphetamine in adderall causes the sweating and longer duration. I'm considering dexedrine because of the 1 d-isomer and shorter duration. Do you think this might help and would my doctor have a problem changing my meds? Also, are the dosages the same for the 2 drugs?