Benadryl One a Day Relief Tablets Benadryl One a Day Relief Tablets relieve the symptoms of hayfever & other allergic conditions such as pet & dust allergies with just one daily tablet, allowing you to carry on with life as normal. They contain the antihistamine cetirizine dihydrochloride to relieve allergy symptoms such as sneezing, runny nose & watery eyes. Benadryl One a Day Relief Tablets can also be used to treat allergic skin reactions such as urticaria, also known as hives, where the skin looks blotchy, with white raised wheals (bumps) surrounded by redness. Benadryl One a Day Relief Tablets are suitable for adults & children aged 12 years & over.