Phenergan

Phenergan: Managing Nausea, Allergies, and Sedation – A Clinical Monograph 1. Introduction: What is Phenergan? Its Role in Modern Medicine Let’s be honest – Phenergan is one of those drugs that’s been around so long we sometimes forget how useful it actually is. Promethazine hydrochloride, sold under the brand name Phenergan among others, belongs to the first-generation phenothiazine class. It’s primarily an antihistamine, but it’s got this weird versatility that makes it useful for everything from motion sickness to allergy-induced insomnia.