Definition
"Diphenhydramine" is an antihistamine medication used to relieve symptoms of allergies, hay fever, and the common cold. It works by blocking histamine, a substance in the body that causes allergic symptoms. Think of it as a bouncer at a club ๐บ, blocking histamine from causing trouble. Unlike decongestants, which clear nasal congestion, diphenhydramine primarily targets allergic reactions. It can also be used as a sleep aid due to its sedative effects. A common brand name is Benadryl.