Any of the antivirals used to treat the herpes virus, eg acyclovir, famvir, valtrex, or their generics.
Just posted in your other thread: This article has recommendations for valacyclovir (preferred) and acyclovir, starting on the bottom of p. 103: http://www.mm3admin.co.za/documents/docmanager/6e64f7e1-715e-4fd6-8315-424683839664/00056616.pdf There is another doctor that prefers famvir.