Benadryl Allergy Tablets contain the active ingredient diphenhydramine hydrochloride, an antihistamine commonly used to relieve symptoms such as sneezing, runny nose, itchy or watery eyes, and itching. This 6-count blister pack is convenient for occasional use and travel. Tablets are intended for short-term, over-the-counter use—follow dosing instructions on the package and consult a physician before use if you are pregnant, nursing, taking other medications, or have preexisting medical conditions. Avoid driving or operating machinery until you know how the medication affects you, as drowsiness may occur. Store in a cool, dry place.