"i have been taking concerta for (adhd) about 3 months now.  the effects have been both positive and negative.  i started off with 36 mg and my grades were increasing rapidly, and i was more focused, but i started to become more antisocial, angry, i didn&#039;t have an appetite, i had sleeping problems and depression.  then about two weeks ago i switched to 54 mg due to lack of focus, and my stomach has been troubling me. i&#039;m having twitching problems, and i am hearing voices."