I was prescribed ritalin 20mg last year when I was 19 when I went to a doc and said I thought I had ADD because I was having problems finishing school. I went off of it for half a year and I went back to the doc a few weeks ago and got back on it. It really helps for getting me to work hard and my school marks sky rocket BUT it puts me in REALLY bad bad moods after a few hours. It's like any drug come down I guess. I went to my doc and told him and he said I could try Concerta XR 20mg and if that didn't work I could try Dexedrine. It's been a week and the concerta hasn't worked at all...it has put me in a weird daze all day though. Has anyone here taken Dexedrine? What are your reactions? Less side effects?. Any info is much appreciated!.