Zovirax 5% Lip Cream is a topical antiviral medication used for the treatment of cold sores caused by the herpes simplex virus. The active ingredient in Zovirax, acyclovir, works by inhibiting the replication of the virus, thereby reducing the severity and duration of cold sores. By preventing the virus from spreading, Zovirax helps to speed up the healing process and relieve symptoms such as pain, itching, and burning associated with cold sores. Zovirax 5% Lip Cream is clinically proven to be effective in treating recurrent cold sores and promoting faster healing.