Can U Tell Me, Whats Are The Side Effects Of

Can u tell me, whats are the side effects of withdraw of velparate syrup after taking ten yrs ?
My son taking this med last 10 yrs. Now he is 11 yrs. Presently his doctor prescribe to withdraw this med gratualy and introduce Triaptal (300). Now this process is going on. His Syp Velparin douses was (10 - 5 - 10) 25ml per day. He is also a ADHD pataient. Now his hiper activity is increasing day by day. Some times he become very arrogant and hit anybody. Is this any side effects of withdraw of Syp Velparin? If it is side effect, how many days it will continue? Give me some advice how to manage this situations ?