PROMETHAZINE HYDROCHLORIDE, USP AND CODEINE PHOSPHATE, USP SYRUP Rx Only
DESCRIPTION
Each 5 mL (one teaspoonful), for oral administration contains: Promethazine hydrochloride 6.25 mg; codeine phosphate 10 mg. Alcohol 7%.
Inactive Ingredients: Artificial and natural boysenberry flavor, citric acid, D&C Red 33, FD&C Blue 1, FD&C Yellow 6, glycerin, saccharin sodium, sodium benzoate, sodium citrate, sodium propionate, sucrose and purified water.
Codeine is one of the naturally occurring phenanthrene alkaloids of opium derived from the opium poppy, it is classified pharmacologically as a narcotic analgesic. Codeine phosphate may be chemically designated as 7.8-Didehydro-4, 5α-epoxy- 3-methoxy-17-methylmorphinan-6-α-ol phosphate (1:1)(salt)hemihydrate.
The phosphate salt of codeine occurs as white, needle-shaped crystals or white crystalline powder. Codeine phosphate is freely soluble in water and slightly soluble in alcohol. It has a molecular weight of 406.37, a molecular formula of C18H21NO3 H3PO4 • ½ H20, and the following structural formula:
Promethazine hydrochloride, a phenothiazine derivative, is designated chemically as (±)-10-[2-(Dimethylamino)propyl] phenothiazine monohydrochloride.
Promethazine hydrochloride occurs as a white to faint yellow, practically odorless, crystalline powder which slowly oxidizes and turns blue on prolonged exposure to air. It is soluble in water and freely soluble in alcohol. It has a molecular weight of 320.88, a molecular formula of C17H20N2S•HCl, and the following structural formula:
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