Virasorb Cold Sore Cream is effective for treating cold sores. Containing the active ingredient aciclovir - an antiviral medication - it helps to reduce the swelling and appearance of your cold sore, leaving you feeling more comfortable as you go about your day. This cream contains the same active ingredient as Zovirax. Packaging may vary as this is a generic listed item. Cold sore cream to relieve painful and irritating sores. Apply to the skin, on the lips and face only.