Opcon-A Allergy & Redness Relief Eye Drops combine an antihistamine with a redness reliever to tackle dual eye allergy symptoms in a single formula. The formula provides fast-acting relief from itching, puffiness, and redness caused by airborne allergens such as pollen, ragweed, and pet dander. Each bottle contains a 30-day supply when used as directed for daily allergy management. The preservative formula maintains sterility throughout the life of the bottle.