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Active Pharmaceutical Ingredients
Promethazine hydrochloride (CAS 58-33-3) is a first-generation antihistamine and phenothiazine derivative. Its molecular formula is C17H20N2S·HCl, synthesized via alkylation of the phenothiazine core with chloromethyl derivatives.
Strictly contraindicated in children under two years due to respiratory depression risks. Store in cool, dry conditions away from light to prevent degradation. Handle with PPE as it may cause severe tissue irritation upon contact.