Brand Names

Famvir ® (There may be other brand names for this medication)

How is it Administered?

Famciclovir is taken orally, as a tablet, either with or without food.

What is it Used For?

Famciclovir is prescribed to treat herpes zoster (shingles; a rash that can occur in people who have had already had chickenpox). It is also used to treat repeat outbreaks of herpes virus cold sores, fever blisters, or genital herpes in people with a normal immune system.

How Does it Work?

Famciclovir is an antiviral medical. It targets an enzyme the virus needs to grow and replicate. Since this enzyme is only found in viral cells, healthy, uninfected cells can grow and replicate as normal.

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