- a phenothiaxine derivative, C17H20N2S, used for the symptomatic relief of allergies and in the management of motion sickness.
Origin of promethazine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- an antihistamine drug used to treat allergies and to prevent vomiting, esp in motion sickness
C20: from pro (pyl) + (di) meth (ylamine) + (phenothi) azine