epi·​neph·​rine | \ˌe-pə-ˈne-frən \
variants: or less commonly epinephrin

Definition of epinephrine 

: a crystalline sympathomimetic hormone C9H13NO3 that is the principal blood-pressure raising hormone secreted by the medulla of the adrenal glands, is prepared from adrenal extracts or made synthetically, and is used medicinally especially to stimulate the heart during cardiac arrest and to treat life-threatening allergic reactions

called also adrenaline

Examples of epinephrine in a Sentence

Recent Examples on the Web

But, according to an announcement from the FDA this week, the epinephrine auto-injectors used in severe allergic reactions are actually totally fine to use for a few months after their expiration date. Sarah Jacoby, SELF, "FDA Extends EpiPen Expiration Date in the Midst of a Shortage," 23 Aug. 2018 EpiPen autoinjectors allow the patient or a caretaker to administer a dose of epinephrine in case of a severe allergic reaction, such as to bee stings or exposure to peanuts. Fox News, "FDA extends EpiPen expiry date to combat shortage," 21 Aug. 2018 Mylan’s life-saving epinephrine auto-injector EpiPen now has a generic rival, the Food and Drug Administration triumphantly announced. Beth Mole, Ars Technica, "Years after Mylan’s epic EpiPen price hikes, it finally gets a generic rival," 17 Aug. 2018 Following her daughter’s death in 2015, LeGere has worked with legislators to provide police officers with life-saving epinephrine auto injections, the Chicago Tribune reports. Serena Sonoma, Teen Vogue, "Annie LeGere Law Allows Illinois Police to Carry EpiPens," 1 Aug. 2018 Symjepi contains the same active ingredient, epinephrine, as EpiPen, which is used to treat anaphylaxis caused by insect bites and foods, among other allergic reactions. Peter Loftus, WSJ, "Novartis Injects Itself Into Planned Rollout of EpiPen Competitor," 2 July 2018 Drugmakers have faced growing pressure over the past year to rein in price hikes, particularly for older drugs such as insulin and epinephrine allergy injections, which have become more expensive without fundamentally changing. Jeremy Olson, chicagotribune.com, "Son's death pushes Minnesota mom into fight against high, rising drug prices," 17 May 2018 Anaphylaxis requires treatment with an epinephrine injector like an Epipen and a trip to the ER. Korin Miller, SELF, "Southwest Airlines Is Finally Getting Rid of In-Flight Peanuts," 11 July 2018 Faced with this rival and growing resistance from insurers, Kaleo last year reintroduced Auvi-Q, its original epinephrine drug. Jared S. Hopkins And Andrew Martin, chicagotribune.com, "When Chicago's 'pharma bros' show up, drug prices can go through the roof," 6 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'epinephrine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of epinephrine

1899, in the meaning defined above

History and Etymology for epinephrine

International Scientific Vocabulary epi- + Greek nephros kidney — more at nephritis

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16 Nov 2018

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Time Traveler for epinephrine

The first known use of epinephrine was in 1899

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More Definitions for epinephrine


ep·​i·​neph·​rine | \ˌe-pə-ˈne-frən \

Kids Definition of epinephrine

: a hormone that causes blood vessels to narrow and the blood pressure to increase


variants: also epinephrin \ˌep-​ə-​ˈnef-​rən \

Medical Definition of epinephrine 

: a colorless crystalline feebly basic sympathomimetic hormone C9H13NO3 that is the principal blood-pressure-raising hormone secreted by the adrenal medulla, is prepared from adrenal extracts or made synthetically, and is used medicinally especially as a heart stimulant, as a vasoconstrictor (as to treat open-angle glaucoma and life-threatening allergic reactions and to prolong the effects of local anesthetics), and as a bronchodilator

called also adrenaline

More from Merriam-Webster on epinephrine

Britannica English: Translation of epinephrine for Arabic Speakers

Britannica.com: Encyclopedia article about epinephrine

Comments on epinephrine

What made you want to look up epinephrine? Please tell us where you read or heard it (including the quote, if possible).


to make faulty or ineffective

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