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Famvir

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Famvir (Famciclovir) is an antiviral drug, used to treat the Herpes viruses, including herpes simplex 1 and 2 and varicella-zoster.


Drug Name

Famvir (Famciclovir)

Drug Uses

Famvir is an oral antiviral prescription medication that is prescribed for: treatment of recurrent genital herpes in otherwise healthy patients; suppression of recurrent genital herpes in otherwise healthy patients; treatment of recurrent herpes simplex virus infections (genital herpes and cold sores) in HIV-infected patients and herpes zoster (shingles).

How Taken

Famvir can be prescribed in one of three ways:Episodic treatment: your doctor treats an outbreak of genital herpes as it occurs. The usual dose of Famvir is one 125-mg pill, twice a day, for 5 days.Suppressive treatment: if you have frequent or severe outbreaks, you take one 250-mg pill, twice a day, for up to 1 year to suppress the genital herpes virus and help to prevent outbreaks.Patients with HIV: Famvir is the only prescription oral antiviral therapy, indicated for treating genital. In patients with herpes simplex and HIV, the dose of Famvir is 500 mg, twice a day, for 7 days.Famvir can be taken with or without food.

Drug Class and Mechanism

Famciclovir is an antiviral drug which is active against the Herpes viruses, including herpes simplex 1 and 2 (cold sores and genital herpes) and varicella-zoster (shingles and chicken pox). It inhibits the replication of viral DNA that is necessary in order for viruses to reproduce themselves. Famciclovir is actually a "prodrug," in that it is not active directly against viruses. Instead, famciclovir is converted to penciclovir in the body, and it is the penciclovir that is active against the viruses. (Penciclovir also is available as a topical and intravenous medication.) Famciclovir is active against the same viruses as acyclovir but has a longer duration of action. Therefore, it can be taken fewer times each day. Famciclovir was approved for use by the FDA in 1994.

Missed Dose

If you miss a dose of this medicine, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do NOT take 2 doses at once.

Storage

Store between 15C and 30C (59F and 86F) and out of the reach of children.