Herpes Zoster Not Responding to Acyclovir Treatment After 10–21 Days

When herpes zoster does not resolve despite a full course of acyclovir, clinicians face the specific challenge of acyclovir-resistant infection. This page outlines the clinical scenario and points to the structured protocol for managing it.

Clinical Scenario

Herpes zoster not responding to acyclovir treatment administered for 10 to 21 days may be considered acyclovir resistant. This situation requires a different therapeutic approach beyond standard acyclovir.

Treatment Approach (partial)

An intravenous antiviral agent distinct from acyclovir has shown a response in this setting, based on retrospective case-series data in immunosuppressed patients.

Full regimen details, dosing, and clinical algorithm available via the complete protocol →

Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1111/ddg.14013

Clinically, VZV infections that do not respond to acyclovir treatment administered for 10 to 21 days may be considered to be acyclovir resistant.

In a small retrospective case series of immunosuppressed patients with acyclovir-resistant herpes zoster, a response to intravenous foscarnet treatment was observed.

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