My 6 yr old son has been diagnosed ADHD. Atm he is being treated with 20 mg of Ritalin LA and 10 mg Chlonidine at night to peal him of ceiling into bed. Since upping the dosage to 20 mg there seems to be more agressive traits coming out. For example, in Summer School, when asked to come in from recess he did not want to comply and had a total melt down which included kicking and hitting teacher and aids. Question is, could this irriatability and agressiveness be a side affect to the Ritalin? If so, are there other medications that seem to have less of this side affect? I know each child is different and have a call into his psychiatrist, but wanted some other opinions. P.S. I am also waiting to hear back from school in regards to getting an independent neuropsychologist evaluation but as we all know, there is a process. School was starting to label him borderline ODD but his pysch doctor was not ready to do that.