Fenistil Cold Sore Cream (Penciclovir), Which Is An Antiviral Medicine Used To Treat Infections With Herpes Viruses. (Cold Sore)
Cold Sores Are Caused By Infection With The Herpes Simplex Virus. Aciclovir Works By Stopping This Virus From Reproducing And Infecting More Cells. This Controls The Infection And Helps The Immune System To Deal With It.