Benadryl is an antihistamine OTC medication used to treat sneezing, runny nose, itching, watery eyes, hives, rashes, itching, and other symptoms of allergies and the common cold. Benadryl is also used to suppress coughs, to treat motion sickness, to induce sleep, and to treat mild forms of Parkinson's disease. Benadryl coupons and discounts are generally available on the Benadryl official site. Coupons and discounts may also be found through other sources online or in printed form. See more at Pharmacy Drug Guide.