SPL Set ID: 636bb9bc-0cc5-4d6a-85be-6471acf01ffc

Each rectal suppository contains 50 mg promethazine HCl with ascorbyl palmitate and polysorbate 80 in a specially blended base of saturated vegetable fatty acids. Promethazine HCl Suppositories, USP are for rectal administration only. Promethazine HCl is a racemic compound; the empirical formula is C 17 H 20 N 2 S•HCl and its molecular weight is 320.88. Promethazine HCl, a phenothiazine derivative, is designated chemically as 10 H -Phenothiazine, 10-ethanamine, N,N α -trimethyl-, monohydrochloride, (±)- with the following structural formula: Promethazine HCl occurs as a white to faint yellow, practically odorless, crystalline powder, which slowly oxidizes and turns blue on prolonged exposure to air. It is freely soluble in water and soluble in alcohol. structural formula