A 42-year-old female asked:
My family member is having a cold sore outbreak and has been taking max dose of acyvlovir 800mg/5 times day for two days, but is now getting another cold sore. what is best course of action? switch to valacyclovir?
2 doctor answers • 2 doctors weighed in
Dr. John Berrymananswered
Obstetrics and Gynecology 56 years experience
Either acyclovir or Valtrex can reduce the length of time a "cold sore" ulcer is present, and prevent additional ulcer formation, but once an ulcer appears, in an individual who has prior exposure to the herpes virus, the treatment with either acyclovir or Valtrex is equally effective in treating the re-emergence of additional ulcers. Reducing anxiety or stress can also reduce new ulcers forming.
Answered Mar 23, 2022
Dr. Hunter Handsfieldanswered
Infectious Disease 55 years experience
Are you sure of the diagnosis? Oral herpes (cold sore) outbreaks usually are outside of the lips or elsewhere on the face. Sores in the mouth (aphthous stomatitis, canker sores) are not herpes. It is quite unusual improvement within 2-3 days of such treatment. In fact, the recommended treatment of choice is a single dose of valacylovir 2 grams; no need for several days Rx.
Answered Mar 24, 2022
Last updated Mar 24, 2022
People also asked
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $44!
50% off with $15/month membership
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.