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Promethazine: Package Insert / Prescribing Information - Drugs.com Promethazine HCl is a racemic compound; the empirical formula is C17H20N2S•HCl and its molecular weight is 320.88. Promethazine HCl, a phenothiazine derivative, is designated chemically as 10H-Phenothiazine-10-ethanamine, N,N, α-trimethyl-, monohydrochloride, (±)- with the following structural formula: Eppeville, Somme, Hauts-de-France, Francie - Město a vesnice na světě Eppeville : Místo Eppeville : Země Francie, Region Hauts-de-France, Oddělení Somme. Informace nejsou k dispozici : Poštovní adresa, Telefon, Fax, Webové ... Promethazine Solution | Cleveland Clinic PROMETHAZINE (proe METH a zeen) prevents and treats the symptoms of an allergic reaction. It works by blocking histamine, a substance released by the body during an allergic reaction. It may also help you relax, go to sleep, and relieve nausea, vomiting, or pain before or after procedures. It can also prevent and treat motion sickness. ...