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Famciclovir(BRL 42810) is a guanine analogue antiviral drug used for the treatment of various herpesvirus infections.IC50 Value: Refer to penciclovirTarget: HSVFamciclovir is the diacetyl 6-deoxy analog of the active antiviral compound penciclovir with potential use in the treatment of infections caused by the herpes family of viruses [1]. Famciclovir, a synthetic acyclic guanine derivative, is a prodrug which, after oral administration, is rapidly metabolised to the highly bioavailable antiviral compound penciclovir [2].in vitro: Famciclovir induced rapid, dose-dependent suppression of viral replication and reduction in alanine aminotransferase (ALT), with greatest efficacy in the 500-mg tid treatment group. HBV DNA reduction was maintained throughout the treatment period. ALT also steadily declined during the treatment period [3]. in vivo: In rat, following dosing at 40 mg/kg, famciclovir was rapidly and extensively metabolized to the active antiviral compound penciclovir, which reached peak concentrations in the plasma (mean 3.5 micrograms/ml) at 0.5 h [4]. Necrotic hepatitis was significantly (p < 0.01) reduced by treatment with FCV, VACV and ACV at a dose of 50 mg/kg per day divided into 3 doses. No significant effect was achieved with BVDU at 200 mg/kg per day. Treatment with FCV at 50 mg/kg per day, ACV at 100 mg/kg per day, and VACV at 200 mg/kg per day significantly (p < 0.001) decreased mortality in mice [5].Clinical trial: Famciclovir Pediatric Formulation In Children 1 to 12 Years Of Age With Herpes Simplex Infection. Phage3