About aciclovir Aciclovir (or acyclovir) is an antiviral medicine.
It treats infections caused by the herpes (herpes simplex), including:
cold sores genital herpes
How to use Acyclovir Cream
Use this medication at the primary sign of infection (such as tingling, burning, redness). Wash your hands with soap and water before and after applying this medication. Clean and dry the affected areas before applying the medication.
Apply to the affected area and rub in gently, usually 5 times each day (every 3 to 4 hours) for 4 days for cold sores, or as directed by your doctor. Apply enough cream to hide all affected areas (red/tingling/burning areas, sores).