Definition of phenylephrine
: a sympathomimetic agent C9H13NO2 that is used in the form of its hydrochloride as a vasoconstrictor, a mydriatic, a nasal decongestant, and by injection to raise the blood pressure
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Merriam-Webster unabridged
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Time Traveler for phenylephrine
The first known use of phenylephrine was circa 1947
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