Definition of ephedrine in English:


Line breaks: ephe|drine
Pronunciation: /ˈɛfədriːn


[mass noun] Medicine
  • A crystalline alkaloid drug obtained from some ephedras. It causes constriction of the blood vessels and widening of the bronchial passages, and is used to relieve asthma and hay fever.
    • Chemical formula: C10H15NO
    More example sentences
    • He studied the tissue distribution and metabolism of caffeine, amphetamines, ephedrine, and narcotic drugs.
    • A 43 year old general practitioner had had juvenile asthma requiring regular ephedrine.
    • If the medicines aspirin, ephedrine, and morphine were once botanicals, how did they get to be tested and marketed as drugs?


late 19th century: from ephedra + -ine4.

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