I've been trying to do something about my ADD for the last few years, but it fell through whenever I tried. I turned 18 a few months ago and finally got around to changing doctors and addressed the issue with her. I started out with strattera at 40 mg for 1 month, then went to 60 mg. It's hard for the person taking it to know if there really are drastic changes, but people like you or my family members and friends are able to see changes. Every medication has it's possible side effects--strattera, like many others have potential cons of mood changes. It made me moody and instead of being able to let go of things I was upset about, I would hold onto them unlike my usual easy-going care free attitude. I went from the 60 mg of that to 20 of adderall xr. The first few days, you would have thought that I was acting out the punchlines of every horrible dumb blonde joke out there. I'm thinking it was probably just the shock of going from a non-stimulant to a stimulant. It's only been about a week, but I think it's going to get better.
Every medication works differently for every person. The way my body reacted to Strattera is totally different compared to the way that other people react to it. I have a friend taking ritalin and when he does, he looks and acts depressed, but gets work done. He says he feels great, though. There are also people on ritalin that you would never know that they were on it.
I don't know much about Focalin, but I just looked it up and it says it treats ADHD, but you said he had ADD. There are certain variables such as dosage and the time it's taken that can make a huge difference. Try looking into other medications. I found this http://www.coreynahman.com/11_25_ADHD_drugs.html
and this http://www.addwarehouse.com/shopsite...l/article3.htm
.maybe it can be helpful. There are also studies about diet changes that can help with inattentiveness. Try looking here http://borntoexplore.org/nutrition.htm
and search for any other dietary changes for ADD patients. I hope I helped and I hope that things go well with him.