Treatment for Primary HSV Outbreak

First-Line Treatment Options

The CDC recommends valacyclovir 1 gram orally twice daily for 7-10 days as a first-line treatment option for primary HSV outbreaks, with treatment extended if healing is incomplete after 10 days 1
The CDC also recommends acyclovir 400 mg orally three times daily for 7-10 days as an alternative first-line treatment option for primary HSV outbreaks 1, 2
Famciclovir 250 mg orally three times daily for 7-10 days is another recommended first-line treatment option for primary HSV outbreaks 1

The American College of Physicians and the CDC recommend initiating treatment within 72 hours of symptom onset for maximum effectiveness in treating primary HSV outbreaks 1
Treatment started during the prodromal period (before visible lesions) is most effective in reducing the severity and duration of primary HSV outbreaks 1, 2

The Infectious Diseases Society of America recommends that immunosuppressed patients, including those with HIV infection, receive appropriate antiviral treatment and may require longer courses than standard 7-10 day regimens for primary HSV outbreaks 1, 4
For severe HSV infections in immunocompromised hosts, the Infectious Diseases Society of America considers intravenous acyclovir, particularly for encephalitis, disseminated disease, or severe mucocutaneous involvement 4

If lesions do not begin to resolve within 7-10 days of appropriately dosed antiviral therapy, the CDC suspects acyclovir resistance in primary HSV outbreaks 1, 3, 4
For confirmed or suspected acyclovir-resistant HSV, the CDC recommends obtaining viral culture and susceptibility testing, and switching to IV foscarnet 40 mg/kg every 8 hours 1, 3, 4

The American College of Physicians and the CDC recommend that patients understand that HSV is a chronic, incurable viral infection with potential for recurrence, and that antiviral medications control symptoms but do not eradicate latent virus 1, 2, 3
The CDC also recommends that patients understand that asymptomatic viral shedding can occur, allowing transmission even without visible lesions, and that consistent condom use reduces but does not eliminate transmission risk 1, 3

The American College of Physicians recommends providing a prescription for episodic therapy to self-initiate at first sign of recurrence, and considering daily suppressive therapy if patient develops ≥6 recurrences per year 1, 2, 3
Suppressive therapy options include valacyclovir 500 mg to 1 gram daily, acyclovir 400 mg twice daily, or famciclovir 250 mg twice daily, as recommended by the CDC and the American College of Physicians 1, 2, 3