ACTIVE INGREDIANTS Acyclovir 5% PURPOSE/ USE Zovirax Cold Sore Cream is effective in the prevention and treatment of cold sores (herpes simplex). Antiviral active ingredient Aciclovir, works by stopping the herpes virus from reproducing & infecting other cells. DOSAGE Apply FIVE times daily during waking hours for FIVE days. PRECAUTIONS Do not use on mucous membranes - eyes, mouth or vagina. Genital herpes requires urgent medical attentionMedicines have benefits and some may have risks. Always read the label carefully and use strictly as directed. If symptoms continue or you have side effects consult your pharmacist or doctor immediately. .