"(18 years old, 104lbs, 5&#039;0) i was on 25 mg and switched to 40mg as i hadn&#039;t noticed anything after a month. so far i have dry mouth sometimes, feel more tired, nausea after taking pill. also, those around had noticed that i am blah all the time after i take it and that i completely change from my upbeat personality to very flat. i will be talking to my doctor about taking a stimulant instead so i won&#039;t have to take it everyday."