What's effective treatment for cold sore?

Pills: Valacyclovir is usual. Acyclovir cheaper but may be more difficult to use and less effective. For occasional episodes of recurrent herpes 2 gram [2 pills] taken immediately, preferably at first tingling prodrome, will ameliorate or even abort an attack. For frequent attacks we use 500mg valacyclovir daily to prevent attacks Various creams are available but not worth discussion because of meagre re