there are a few threads on it in the AR spa. Search pantothenic acid or B5 but from my searches some of the most common ways of doing it are for the first month take 10g a day in divided doses and then after that first month take 3-5g for as long as you want. But I would search for it and look up as much as you can about peoples average dose
A couple links I found:
http://forums.steroid.com/showthread...ht=pantothenic
http://forums.steroid.com/showthread...ht=pantothenic
Also try googling pantothenic acid and acne and that might give you alot more advice