My 8 year old step- son suffers from ADHD, which sounds just like your son.
We fought the idea from the beginning. So many people having differing ideas, and strongly believe each way. We waited several years, to see if he would grow out of it. He didn't. It got to the point that the teachers were insisting that something drastic be done, or else he would be held back, which would be a shame, as he certainly is intelligent.
We took him to several specialists, and they all agreed that is what he had. Some will try to say that it is a lack of dicipline, but that is not the case. We read some books, and oh my, it seemed as it was written about our son. The descriptions were so right on, it was almost scary.
Then we realized, it is not a "bad" thing. If there is a medication out there that will help, why not use it? Some consider it to be a defeat, however, it should be realized as a blessing, and thankfully we live in a day and age that these challenges can be helped.
Our son does much better now, on the days he takes the medication. We are in touch with his teacher on a regular basis, and she says the days he does take it, he does much, much better. Day and night difference.
His father still fights it to this day. He is constantly finding new theories, etc, but none of them match up.
I hope it works out for your family.
If you want more details, or talk to my wife about it, feel free to leave a private message.