Is there a medical treatment for Tourettes Syndrome?

My 16-year old son has a mild form, in that he does not curse. However, he does say inappropriate things, and is becoming particularly distressed at the jerky head and upper-body movements he feels he has to make. It's a particularly bad time for him as he's becoming conscious of what other people, particularly girls, think of him. Is there anything he can take to alleviate the physical symptoms?