In the pharmaceutical industry, Promethazine Hydrochloride 25 mg is a versatile, first-generation phenothiazine derivative. As a pharmacist and manufacturer, I classify this as a “multi-functional antihistamine” because it possesses antihistaminic, sedative, antiemetic, and anticholinergic properties all in one molecule. Primary Clinical Uses Allergic Reactions: Treatment of hay fever (allergic rhinitis), allergic conjunctivitis, and skin conditions … Continue reading What is Promethazine Hydrochloride 25mg used for?