Sometimes the ADHD drugs can actually make a child more anger ridden and more violent.
I would talk to the doctor again about it ASAP and preferably a child psychiatrist.
HOw is teh school handling this?
Look up sleep deprivation and look at the mental illness it causes. These drugs don't let them sleep and he will continue to get worse. He could be having bad dreams just because of the medicine. If he's having bad dreams he could be awake while you are asleep and you don't know it. Cure the sleep problem. Don't put a label on your child. There are not 2 kinds of kids (a normal one and an adhd one). There is only one kind of kid and they are all human. If you look up feather plucking you will see that birds in human homes where lights and Tv's are on for many hours will self mutilate and eventually kill themselves if not treated. They start off with biting and screaming and it goes downhill from there. I have healed many a bird with this same problem with no drugs. There is no kid that needs less sleep only kids that can't sleep.
and from somewhere in the middle of the last two posts.
You say the drugs aren't working. The question is not working when? Is he the same way at school? Or is it only at home? One answer would indicate that the drug dosage is incorrect. The other would indicate that the meds are wearing off. Either way, his doctor needs to know what is going on. Doctors usually start kids off on the lowest possible med, and wait for parental feedback to decide what to do next.
I am also worried about the anger. If it is over in say 30 min or less, its probably ADHD related. If the anger goes on for hours, he may be bipolar which is a whole different treatment.
I think the most important question is - has he gotten worse since he has been on meds? If so, then the meds have to be stopped or switched, but his doctor definitely has to know what is going on.
Finally working with a child that has ADHD is different than working with a normal misbehaving child. While immediacy and consistency are important for both kinds of kids, the ADHD child presents many more challanges. I would highly suggest getting the book, "The ADD/ ADHD Answer book," by Susan Ashley. It will really help you in working with him.
But your first step is to let your doctor know what is going on. Oh, and if you are seeing a pediatrician who after your first visit prescribed meds, I would highly suggest finding a psychologist or psychiatrist who specializes in kids with behavior problems. You will get more than just a bottle with a quick fix. Best wishes.
You need help with parenting, not drugs. Behavioral problems are not always ADD. In fact, they rarely are. Get some expert advice on learning how to handle your son.