Hurting other children

Has he been evaluated for any other disorders, my 5 yo has ADHD and ODD, this makes him more angry and distructive if he doesnt get his way or is fusterated or teased. We have changed his meds 3 times since he was diagn in August (he was RX concerta which he couldnt swallow and the next day they RX him ritialan 30mg that i could sprinkle in his drink and he said it tasted funny so he would drink it so we hust got him the new chewable which seems to be working so far he had a little set back last week..)

Hi, I'm new to the message board.  I'm so frustrated that I really don't know where to turn next.  My child was diagnosed with ADHD last spring and was started on Ritalin, 5 mg (he's 5 y.o).  He had a really hard time in preschool with various social issues (pushing others, etc.)  Now we have him in a half day kindergarten because I just knew he couldn't handle all day.  For the first month he did really well, but starting last week, he started lashing out at everyone. He's now been dubbed "the bad boy" and no one wants to even sit next to him.  This has resulted in even more lashing out, as he is now frustrated and he told me he doesn't want to go back to school.  Has anyone else experienced this?  Do I just keep him away from everyone else, which is self defeating??  Has anyone else had success with changing medications? 

Thanks for anyone's help! 

On my first day of year 2, I attended my son to his class and found his desk and sat there with him for a while.  During going through his new books with him a little girl came up to him and said hello.  Another boy told the girl - "dont talk to him, he is really bad"

So to answer your question - YES - we have experienced it.  Luckily for my son, he was distracted at the time  and never heard it.  Now I give that boy the evil eye every time I see him .  Funnily enough they were cast opposite each other in a class play.  My son was the Giant and this  boy was jack.