"i have been on methylin er for about a year and a half. i still have a lot of difficulty with adhd symptoms, but the medication helps.  i can tell when i don&#039;t take it properly, my symptoms increase.  i have only had to increase the dosage once in about six months. i think that i need another increase now. i have not had any problems with side effects. my appetite is fine, no sleep issues (if anything, i sleep better now), no anxiety or increased blood pressure."