Firstly, you need to change Doctor's. I am currently on a Valium withdrawal pro gramme ( doc prescribed it originally for bi-polar ). I am withdrawing by 1mg per week. So far I have not experienced any withdrawal effects. It may take up to one year, but it sure beats being addicted to the stuff. It is evil. Good luck.
how old is he,why was he given them,if your still his guardian then you can ask for second opinion,if not are you sure hes addicted has he done anything about it himself or are you just overly concerned.