"Did your son eat a lot of sugar everyday ? Try to eliminate his sugar intake to see if his hyperactivity will be controlled. Then you may try to give him Omega DHA (fish oil) to see if he will improve a bit more. Sugar and articfical favors will cause hyperactivity. Fruit, dry fruit, juice, candy, even rice, potatoes, etc are all produce sugar, limit his intake of sugary food should help. My kid was like that for a period of time last year especally when she's sick and had to took lots of cough cyrup(they are sweet and with articfical favour/chemicals).
BTW, did your son had Asthma 哮喘 too? Those medicine for preventing Asthma and curing it(口 服 式 或 吸 入 式 ( 噴 霧 劑 ) 藥 物 )will cause hyperactivity as well."