"i have been taking adderall xr 30mg for about 7 months now and i am starting to get concerned. i started out with 20mg, but was still very impulsive, so upped the dose to 30mg. i can focus and listen really well, but i am noticing increasing negative effects. i noticed dizziness right away, but this improved after a few weeks. then i started to notice myself constantly stumbling over words when talking. i have never had that problem before. i began to get headaches every day about two months ago and it is getting worse daily. that&#039;s a big concern to me because amphetamines are bad for the liver and kidneys as it is, and now i have to take increasing doses of ibuprofen just to &quot;take the edge off&quot; of the headaches. "