It's known as "diphenhydramine," which has many brand names. The most common is "Benadryl." Benadryl is an antihistamine, which counters the effects of histamine. Histamine causes itching, sneezing, watery eyes, and a runny nose (popular during allergy season).
My expert advice is to always throw a pill away that you find laying around. Never take medicine unless it's in a bottle in YOUR home.
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