I don't know anything about that drug, but my grandson had the same problem and whatever he was on helped. He is now 15 and has outgrown it.
Hang in there, it is always hard on us as mothers when one of our children is having a problem. If you trust your Doctor, then do as he says and read all you can to educate yourself to the problem.
I will keep you in my prayers and thoughts.
Ninnie