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is an anti-viral medication which after transformation in human organism turns into penciclovir which is active against such viruses as Herpes simplex (types I and II), Varicella zoster, and the Epstein-Barr virus (EBV). Penciclovir penetrates into the cells infected by virus where being subjected to treatment by viral ferments it turns into penciclovir-triphosphate which inhibits replication of viral DNA. The medication has not effect on the non-infected cells.
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is active against certain strains of Herpes simplex with changed DNA polymerase which are resistant to Acyclovir (Zovirax).