If this isn't something that starts a flame fest, I don't know what will.
Personally, I think doctors and parents are too quick to jump to medicine in order to deal with kids.
(Before I get into this, the two sons I refer to in here are from my first marriage, and live primarily with their mother).
My oldest son (almost 10) has been diagnosed with ODD AND OCD (Oppositional Conduct Disorder), has a teachers aide at school, a counsellor, etc etc. In my opinion, he is just an angry, confused child who doesn't know how to deal with his emotions.
He has been through the separation and divorce of his mother and I, numerous court cases for shared access (custody), his mothers very poor choice of relationship with a sever manic depressive, not too mention his mother also being a very manipulative and vindictive person who fills his head with lies, especially about me (and that is no exaggeration).
My second son was diagnosed with ADHD at age four. This is clearly ridiculous, because if you do your homework, you will know that ADHD CANNOT be properly diagnosed before age 6. He was put on all sorts of medication, constantly having the type and dosage changed. He was later diagnosed with mild ODD, which was then disregarded. He was diagnosed with mild Autism last year, which would explain some of his behaviour and mannerisms, but he is still on ADHD meds for reasons I am not too sure about. I get very little say in medical treatment and decisions of the children, and any say I do get is overridden by my ex-wife.
The amazing thing is that when they are with us, we have very few, if any, issues. This is because we have very clear rules, and a very structured program during school holidays for the kids. We give them our time, and out attention. This, I believe, is something many parents are failing to do. They are too busy for their kids, and when the kids start to seek attention by disruptive means, they are put on medication. It's a real shame, because it only harms the kids in the long term.