<unk> (oral) is a antiviral agent that is FDA approved for the treatment of herpes zoster, genital herpes, and chickenpox.   Common adverse reactions include nausea, vomiting, diarrhea, and malaise.
Acyclovir 
Valacyclovir
Penciclovir
Famciclovir
Valganciclovir hydrochloride
Ganciclovir 
Cycloserine
Intravenous immunoglobulin