Denavir

Brand for penciclovir

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What is Denavir?

Denavir is a prescription antiviral cream used to treat recurrent cold sores (herpes labialis) caused by herpes simplex virus type 1. Applied directly to the affected area, it works by blocking the enzyme the virus needs to replicate its DNA—limiting the virus's ability to spread and shortening the duration and severity of the outbreak. It's applied every 2 hours while awake for 4 days, starting at the earliest sign of a cold sore such as tingling, itching, or redness. Early application gives the best chance of reducing the outbreak's impact.

Viral DNA polymerase inhibition

Denavir is activated by a viral enzyme (thymidine kinase) inside HSV-infected cells and then blocks the viral DNA polymerase, preventing the virus from replicating its genetic material and producing new viral particles.

Virus-selective activation

Denavir is preferentially activated inside herpes-infected cells rather than healthy tissue—concentrating its antiviral effect at the site of active viral replication while minimizing effects on surrounding uninfected skin.

Early-use outbreak shortening

Clinical studies show meaningful reductions in healing time, pain duration, and viral shedding when applied at the first sign of a cold sore—making prompt application at the tingle or itch stage essential for maximum benefit.

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