I use it before I lift and it really helps me get a good workout. Doesn't really help me much with studying though. This effect is probably because I don't have ADHD.
also I tend to feel uncomfortable and paranoid on it, so I use it sparingly.
I used it to cram for a calc test once - did 6 hours of work in about 4 and great concentration the whole time.
Never used it again as I didn't want it to become a crutch to get me out of situations which resulted from my own lack of discipline in the first place.
It is funny I just saw this post, because I just took some an hour ago and now I am bouncing off the Walls..I feel speedy as fuck becaus eI havent been able to get my hands on some in a while...but I am using it study for work related exams.....it helps so much...I love bumping it before I go out at night....
I have had a scrip for ritalin for about 15 years now and i must say that if you do have ADHD it workd miracles. I used to not use it that much but in the past two years i have been doing some ridiculous studying (mechanical engineering major) and it has helped me study for hours on end. I really don't like the way it makes me feel so i ONLY use it before class and studying. It makes me get all bugged out and makes me feel like not saying a word, but when working on something it will put you in the ZONE.
I've got a script for adderall and I love it. I usually take 20mg before I go to class, and sometimes another 10 before I study. If I take it all the time I get a tolerance fast. I alternate between adderall and ephedrine/caffeine/tyrosine. That combo works great too.