Welcome! I'm glad you found us.
Sharon gave you some good info. I will add to it by saying that when medications don't work, it's generally one of three options: the dose is wrong, the medication is wrong or the diagnosis is wrong. If your difficult child has not been evaluated by both a neuropsychologist and a child psychiatrist, I would start there to make sure you are dealing with just ADHD. The symptoms of many disorders mimic each other, and it's important to figure out what is what so you can put the proper interventions into place.
I will also tell you that you should take talk of depression seriously. Concerta over the long haul can depress (it happened to my difficult child 1). Furthermore, mood issues like anxiety and depression can fuel many of the oppositional behaviors you have posted about.
Again, welcome.
