Acivir Cream is a topical medication that is used to treat cold sores, herpes simplex virus infections of the skin, and genital herpes. It contains the active ingredient Acyclovir, which belongs to a class of antiviral drugs that work by preventing the virus from multiplying and spreading. Acivir Cream can help reduce the severity of symptoms such as pain, itching, and burning associated with these viral infections. It is applied directly to the affected area of the skin and should be used as directed by the healthcare provider. Acivir Cream is available only with a prescription and is sold under various brand names.