Benadryl Syrup is used to relieve symptoms of cough, cold, and allergies such as dry cough, sneezing, runny or blocked nose, throat irritation, and mild fever. Do you need help relieving allergies or a pesky itch? Check out the many allergy and itch relief products BENADRYL® offers which may help provide relief. Benadryl is a brand of various antihistamine medications used to treat allergies, whose content varies in different countries, but which includes some … Benadryl® (diphenhydramine) is a liquid medication that treats the symptoms of allergies and allergic reactions. It may also prevent and treat motion sickness …