There is Diphenhydramine Hcl offered by us that is an antihistamine that reduces the effects of natural chemical histamine in the body. Diphenhydramine is used to relieve red, irritated, itchy, watery eyes; sneezing; and runny nose caused by hay fever, allergies, or the common cold. Diphenhydramine is also used to relieve cough caused by minor throat or airway irritation. It is an antihistamine used to relieve symptoms of allergy, hay fever, and the common cold. Diphenhydramine Hcl is very effective.