"my 11 yo has been on concerta for 2 months. the first few days he did experience some nausea although went away. after the first week i could tell a huge difference in his attitude.. he suddenly had a sense of humor, engaged in conversation without being distracted, and was bringing home/completing homework with no trouble! his grades have immensely improved!! i can tell a difference (not huge) on the weekend days he doesn&#039;t take it. or if he didnt sleep well the night before and when it begins to wear off in the evening he tends to be a little grouchy. only other down side i&#039;ve noticed so far is that he has lost approx 4lbs/mo which is concerning if it continues. so far, happy with the results!"