Acyclovir Treatment for Cold Sores on the Lips

Treatment Options and Efficacy

Oral antiviral medications, such as acyclovir, valacyclovir, and famciclovir, are more effective than topical treatments for herpes labialis, decreasing outbreak duration and associated pain by approximately 1 day 2
Treatment should be initiated within 24 hours of symptom onset for maximum effectiveness, ideally during the prodromal stage, as recommended by the Centers for Disease Control and Prevention 3, 1
Short-course, high-dose regimens offer greater convenience, are cost-beneficial, and may improve patient adherence, according to the American Academy of Dermatology 1, 2

Valacyclovir, with a regimen of 2g twice daily for 1 day, is an FDA-approved treatment for cold sores on the lips 1
Acyclovir, with a regimen of 400mg five times daily for 5 days, reduces the duration of symptoms compared to placebo, as reported by the Journal of Clinical Virology 4
Famciclovir, with a single-day high-dose regimen, is also an FDA-approved treatment for cold sores on the lips, as recommended by the Infectious Diseases Society of America 1, 2

First-line therapy is oral valacyclovir 2g twice daily for 1 day, due to its high bioavailability and convenient dosing, as recommended by the American College of Physicians 1
Alternative oral options include famciclovir and acyclovir, which can be considered for patients who cannot tolerate valacyclovir, according to the National Institutes of Health 1, 4