you cannot make a general statement regarding this- all kids react differently to different therapies.
as a general review; ADHD is a Disruptive behavior Disorder. There are 3 types, Primarily inattentive, Primarily Hyperactive, and bith combined. Approximatly 50% of ADHD kids have a codiagnoses of a conduct disorder, 25% have an emotional disorder, and 20% have a learning disorder. If untreated, 70% will continue to have major symptoms. The best treatments are a combination of parent training and meds (please note- parent training does NOT mean just giving them the pills and thats it). 2 of the best parent training guides are Barkleys parent training and Phalans parent training (look them up online). There has been alot of progress in staying off the Psychostimulants (Ritalin) and using Anti-Hypertensives (blood pressure meds) instead. Please speak to your doctor about it.
I give these facts only because you need to do whats best for the kids that has ADHD. General comments about staying off meds can be more detrimental than helpful.