Dear J.,
Actually there is a connection with this and drug addiction but it is well hidden like so many things. What happens to a lot of these children that are put on these drugs is they get about 21 and start to go psychotic, a proven fact. I know there are extreme cases and maybe meds are the only answer or a temporary answer, but basically speaking it is hardly ever the truest answer.
There is a lot of research and evidence out there you need to find it. If it were me (and I know it's not), I would in the very least, wait, it is something you can do later if you really feel the need. Most of the time when hesitant it's best to wait. Don't let the system pressure you and they will if you say you want to wait. This is your choice.
My son was diagnosed too at a very young age (around 5) and we were always going to the school psy. and all the other constant testing and everything else. At first I went along with everything and did everything they told me to do. Then at a certain point when he was about 11 they said, "he thinks too much and so we want to put him on medication". I said, "absolutely not, he thinks too much, you mean because he's drawing jets and machines and figuring math formulas and building machines and figuring things out." He had no behavior problems - all the teachers said they wish all kids were as sweet as he was, even other parents came up to me and told me how kind he was to their child. All the school did was put a box around him and want him to go by their list. They did not help him they made him worse. He could hardly read yet, but math was far beyond his age according to their tests.
Well, this gave me the courage to say enough and I took him out of school. That's when I really realized who my son was and at what level academically he was. At first, not knowing any better, I did the flash cards and all the other stuff they did and told me to do. And the sweet kid he was, he put up with it. Then one day I saw his face, I mean really saw his face and the life draining from it, there was no delight or happiness. So I put the flash cards down and said," enough of this, what do you want to do, if given anything you want to do what would it be?' He was taken aback for a moment and then said, "I want to build a motorcycle." So I bought him some motorcycle mechanical magazines, went to the library and we began to read. It was amazing how in just a few short weeks he was reading at a "normal" level. He found a frame to buy and parts all himself and he built a motorcycle piece by piece and three more through his teens. He did all other academics so much better and gradually I learned more about learning/teaching. Got a good curriculum. You see the school was dumbing him down. He couldn't have cared less about their reading lessons, there was nothing interesting in them. They were draining the life from him. He is now a computer designer for jets and such, speaks three languages, has traveled extensively, was the head of the student body at school, the first to do many things at his school and was in the papers, etc., has a masters degree is a good man and father and husband - and those jets and machines he use to draw so technically as a kid even as young as 6 and 7 have all been invented since, but then they hadn't been invented yet. And he's still inventing.
This from a guy they said would be lucky if he could go to become a mechanic (as if mechanics are dumb - see how our world thinks). I told them he's already a mechanic and then some. Also, as we don't have the $, he put himself through school working full time the first few years and then part time and received many scholarships to continue.
Read the evidence - most of the children being diagnose as ADD and ADHD are a product of this dumbing and pushing academics before they're naturally ready. It's also from tv, computer and games and the like. It interfers with the wiring in the brain. When they're older these things are fine within reason. But really, if one were really following the way the human brain grows, one would wait till they were 12-14. It's also from additives in the foods and many people have cured it from simpifying their home and changing the diet to no chemicals and dyes and such. For example, at seven years it's a perfect time to learn to knit with two wooden needles. (boy and girl) Handwork like sewing with felt - making bean bags, little purses, little dolls, etc. make a great difference to balance the brain. And lots of play time outside, hiking, discovering, building things outside like forts and such and a lot of climbing and walking on balance beams and or logs, etc. And lots of imaginary play is imperative. When children don't get these natural things in their lives it up sets the natural rythms of the brain to just say one thing. You might want to look into the left and right sides of the brain research too.
Please invesitgate this before doing it. I've seen the results of it and it's not pretty. I can hardly believe "they're" still doing this to children after all the studies and evidence. But it's big business for ya.
You may take this as you will (obviously) but please know it is in the best interest I write this and with all good intent. I am an advocate for children and for our world at large. Obviously, I don't know your whole story or your son and I am no expert, but I do know something and I've been through a lot with a lot of people throughout my life. Really, the dr is no expert either, he knows what he's been trained to do (for lack of true education with few exceptions). The educational system and medical society aren't out to do what's best for your child (I use to think they were) they do what pays. The school gets paid by the federal government for every child they have in special programs for this and for the drugs. I was just shocked when I found this out. - I know you love your son and want the best for him, this is why I write this as unconventional as it may seem.
This is very long and I hope it's not too much. I send all good thoughts for you and your son and prayers for health and well being and happiness.