epinephrine
noun
epi·neph·rine
ˌe-pə-ˈne-frən 
variants
or less commonly epinephrin
: 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
Treatment for severe reactions includes using epinephrine and calling 911 for emergency medical help.
—
Corinne Savides Happel, Verywell Health, 5 Mar. 2025
None of the children in the immunotherapy group had a severe enough reaction when consuming peanut protein at home to need a shot of epinephrine, and just one needed the medication during a visit to the study site.
—Linda Carroll, NBC News, 10 Feb. 2025
In the event of anaphylaxis, adrenaline, also known as epinephrine, should be administered, such as with an EpiPen, and 911 should be called.
—Hatty Willmoth, Newsweek, 21 Jan. 2025
Beta-blockers block the action of epinephrine (also known as adrenaline), a substance produced in the body that can increase heart rate and blood pressure.
—Karen Berger, Pharmd, Verywell Health, 13 Mar. 2025
See All Example Sentences for epinephrine
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Corinne Savides Happel, Verywell Health, 5 Mar. 2025
None of the children in the immunotherapy group had a severe enough reaction when consuming peanut protein at home to need a shot of epinephrine, and just one needed the medication during a visit to the study site.
—Linda Carroll, NBC News, 10 Feb. 2025
In the event of anaphylaxis, adrenaline, also known as epinephrine, should be administered, such as with an EpiPen, and 911 should be called.
—Hatty Willmoth, Newsweek, 21 Jan. 2025
Beta-blockers block the action of epinephrine (also known as adrenaline), a substance produced in the body that can increase heart rate and blood pressure.
—Karen Berger, Pharmd, Verywell Health, 13 Mar. 2025
See All Example Sentences for epinephrine
Cite this Entry
“Epinephrine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epinephrine. Accessed 29 Mar. 2025.
Copy CitationMedical Definition
epinephrine
noun
epi·neph·rine
variants
also epinephrin
: a colorless crystalline 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 to stimulate the heart during cardiac arrest and to treat life-threatening allergic reactions
called also adrenaline
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