Penciclovir (INN) /pɛnˈsaɪklɵvɪər/ is a guanosine analogue antiviral drug used for the treatment of various herpesvirus infections. It is a nucleoside analogue which exhibits low toxicity and good selectivity. Because penciclovir is absorbed poorly when given orally (by mouth) it is used more as a topical treatment and is the active ingredient in the cold sore medications Denavir (NDC 0135-0315-52) Vectavir and Fenistil.
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