<s>[INST] i'm 40 years old with ADHD. I have been taking 27mg of Concerta for 8 days. the first 6 days were awesome, no side effects at all (well besides loss of appetite) Yesterday started feeling side effects. I thought I was getting sick but now that I'm reading about everyone's side effects, that's what I'm feeling. Very bad headaches, stomach hurts at different times of the day, twitching muscles in my arms, heart pounding rapidly...etc.. I absolutely love that it helps me concentrate for hours and hours at a time with college.. Will these side effects go away after a few weeks? Please help me!!!!!! [/INST] Hi there ~I understand your concerns.  It is difficult to live with adult ADHD.  I am glad that the medication is helping you with the concentration and helping improve your performance in college.  I am also glad to know that you did not have any side effects initially.  I believe that you are having these effects from the medication due to being on a high dose, you might want to consult your psychiatrist to try reducing the dose to 18mg and still have the same effects from the medicine but not the adverse reactions.I hope this helps.  Take care and have a lovely day! </s>