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promethazine

American  
[proh-meth-uh-zeen, -zin] / proʊˈmɛθ əˌzin, -zɪn /

noun

Pharmacology.

  1. a phenothiaxine derivative, C 1 7 H 2 0 N 2 S, used for the symptomatic relief of allergies and in the management of motion sickness.

promethazine British  
/ prəʊˈmɛθəˌziːn /

noun

  1. an antihistamine drug used to treat allergies and to prevent vomiting, esp in motion sickness

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of promethazine

1950–55; propyl + (di)meth(ylamine) + (phenothi)azine, components of its chemical name

Example Sentences

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Other first-line medications include cyclizine, promethazine and prochlorperazine.

From BBC • Dec. 10, 2025

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.