L.,
My son was diagnosed at age 4 with ADHD w/hyperactivity and impulsivity versus inattention. He is now 13 and doing great!
I can sympathize with you. Medication is a very up and down ball game and there may be two or three different ones that are tried before one works with your child.
If you are using your pediatrician, I would highly recommend that you get a referral to a child psychiatrist for meds only. Pediatricians do not have the indepth knowledge of all the drugs on the market and generally will only prescribe one or two that they feel comfortable with however those might not be the ones that work with your son.
From my experience with my son the medicine Concerta seems to have worked the best with the fewest side effects. Along with that behavior modification so that the child has the building blocks to change his behavior (this is not just for kids w/behavior issues). They can teach them ways to compensate for their lack of inattention. Basically coping strategies.
The more coping strategies they have the lower the meds they will need or maybe not need them at all.
Anyway, don't know if any of this helped but if you want to talk to someone who has been through it all please feel free to email at ____@____.com .
C.