How often do I have to take valacyclovir? November 04, 2019 22:17 To treat a cold sore outbreak, you can take 2000 mg (2 tablets) valacyclovir twice a day for one day. Related articles How effective is valacyclovir? How long does it take to get valacyclovir? How does valacyclovir work? What is a cold sore? Can an outbreak be prevented?
