Valacyclovir
"Valacyclovir worked extremely well on the pain, blisters, burning and itching, but the nausea and headache were just as extreme.  I could only take the valacyclovir for 2 days, then decided the pain was more bearable than the constant nausea.  My doctor is going to try famciclovir and see if I do any better with the side effects."