Ganciclovir / Simplovir / Natclovir / Virson / Gancigel / Clygan GANCICLOVIR CategoryAntiviral DrugsActionInhibits viral replication ( viral DNA polymerase) depends on viral thymidine kinase for phosphorylation. IndicationOcular Feline Herpes virus (FHV-1) DoseCats - q4 - 6h small amount to affected eye (max -3 weeks) ContraindicationsOcular irritationAdverse EffectsHepatic dysfunction, Myelosuppression , CNS effects - convulsions, coma, Fever, Phlebitis. AvailabilitySimplovir eye gel - 5gNatclovir - 250 mg capsuleVirson gel - 5gNatelovir - 500 mg tabGancigel eye ointment- 5 gClygan gel 1.5g DOSE CALCULATOR