H1 antagonist

noun
\ ˈāch-ˈwən- How to pronounce H{inf}1{/inf} antagonist (audio) \
variants: or H1 receptor antagonist also H1 blocker

Medical Definition of H1 antagonist

: any of numerous drugs (such as fexofenadine or loratadine) that bind competitively with histamine to H1 receptors on cell membranes and are used to relieve allergic symptoms and variously as sedatives, antiemetics, and anticholinergics H1 antagonists prevent and relieve the sneezing, nasal and ocular itching, rhinorrhea, tearing, and conjunctival erythema of the early allergic response to antigen, but they are less effective for the nasal blockage characteristic of the late allergic reaction.— F. Estelle R. Simons and Keith J. Simons, The New England Journal of Medicine

Learn More About H1 antagonist

Dictionary Entries Near H1 antagonist

H

H1 antagonist

H1N1

Cite this Entry

“H1 antagonist.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/H1%20antagonist. Accessed 18 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!