Famvir, with its active ingredient famciclovir, is an antiviral medication primarily used in the treatment of infections caused by herpes viruses, including genital herpes, cold sores, and shingles (herpes zoster). It works by inhibiting the replication of viral DNA, thereby reducing the severity and duration of symptoms. Famvir does not cure herpes, but it can help manage the outbreaks and decrease the risk of spreading the virus. It is most effective when taken at the first sign of an outbreak, as directed by a healthcare provider. Famvir is available by prescription and comes in tablet form, making it convenient for oral administration.