Definition of ephedrine
: a crystalline alkaloid C10H15NO extracted from a Chinese ephedra (Ephedra sinica) or synthesized that has the physiological action of epinephrine and is usually used in the form of its hydrochloride or sulfate as a bronchodilator, nasal decongestant, and vasopressor — see ma huang, pseudoephedrine
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Merriam-Webster unabridged
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Time Traveler for ephedrine
The first known use of ephedrine was in 1889
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