A common antihistamine medication used to treat allergies, hay fever, and itching, also used as a sleep aid in many over-the-counter products.
From 'diphenyl' (two phenyl chemical groups) and 'hydroamine' (an amine containing hydrogen), reflecting its chemical structure. Developed in the 1940s as one of the first antihistamines.
Diphenhydramine was a miracle drug when it arrived—for the first time, people with allergies could actually sleep through spring instead of suffering all night, and chemists had cracked the code of allergy response!
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