Treatment of Persistent Orolabial Herpes Despite Valacyclovir

Immediate Management Adjustments

• The Centers for Disease Control and Prevention recommends switching to topical penciclovir cream (Denavir) applied every 2 hours while awake for 4 days for persistent herpes labialis not adequately responding to valacyclovir 1

Correct Valacyclovir Dosing for Orolabial Herpes

• The appropriate regimen for recurrent herpes labialis is valacyclovir 2000mg twice daily for ONE day only, as recommended by the CDC 2
• For orolabial lesions requiring longer treatment, the CDC recommends valacyclovir 500mg twice daily for 5-10 days 1
• Alternative: acyclovir 400mg orally 5 times daily for 5 days, as suggested by the CDC 1

When to Suspect Treatment Failure and Resistance

• If lesions do not begin to resolve within 7-10 days after initiating appropriate antiviral therapy, suspect acyclovir resistance, according to the CDC 1, 2

Treatment of Acyclovir-Resistant Herpes

• IV foscarnet 40mg/kg every 8 hours until complete clinical resolution is the treatment of choice for acyclovir-resistant HSV, as recommended by the CDC 1, 3
• All acyclovir-resistant strains are also resistant to valacyclovir and most are resistant to famciclovir, according to the CDC 3

Special Considerations for This Patient

• If HIV-positive or otherwise immunocompromised, higher doses are required: acyclovir 400mg orally 3-5 times daily until clinical resolution, as recommended by the CDC 1, 3
• Severe cases in immunocompromised patients require IV acyclovir 5mg/kg every 8 hours, according to the CDC 3
• Daily suppressive therapy with valacyclovir 500mg once daily can reduce recurrence frequency by ≥75% and is safe for extended use, as suggested by the CDC 1, 4

Critical Pitfalls to Avoid

• Monitor renal function if using high-dose IV acyclovir, with dose adjustments for renal impairment, as recommended by the CDC 1