Diphenhist (
diphenhydramine) is an
antihistamine used to treat symptoms of
seasonal allergies including
sneezing,
runny nose, and
itching or watering eyes. It works by blocking the action of histamine which causes
allergic symptoms. It is available over-the-counter, and also sold as generic diphenhydramine. Other brands include
Benadryl. Get Diphenhydramine for as low as $2.51, which is 75% off the average retail price of $9.94 for the most common version, by using a GoodRx coupon.
