Generic name: promethazine hydrochloride
Dosage form: oral syrup
Drug classes:Antihistamines, Phenothiazine antiemetics
Medically reviewed by Drugs.com. Last updated on Oct 1, 2021.
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Promethazine Syrup Description
Each teaspoonful (5 mL) of Promethazine Hydrochloride Syrup (Promethazine Hydrochloride Oral Solution, USP) contains 6.25 mg promethazine HCl in a flavored syrup base with a pH between 4.9 and 5.4. Alcohol 8%(v/v). The inactive ingredients present are: anhydrous citric acid, ascorbic acid, D&C yellow No. 10, edetate disodium, FD&C blue No. 1 powder, FD&C red No. 40, glycerin, methylparaben, natural and artificial strawberry banana flavor, natural fruit punch flavor, purified water, sodium benzoate, sodium citrate, sodium propionate, sodium saccharin, and sucrose.
Promethazine hydrochloride is a racemic compound; the empirical formula is C17H20N2S•HCl and its molecular weight is 320.88.
Promethazine hydrochloride, a phenothiazine derivative, is designated chemically as 10H-Phenothiazine-10-ethanamine, N,N,α-trimethyl-, monohydrochloride, (±)- with the following structural formula:
