Medical News Today: Benadryl (diphenhydramine)

Benadryl (diphenhydramine) is a brand-name, over-the-counter product that's typically used to relieve symptoms of hay fever (seasonal allergies), other allergies, and the common cold. It's also used to relieve itchy skin due to insect bites, hives, and other causes. Learn about side effects, warnings, dosage, and more.