Chlorpromazine Hydrochloride Tablets
» Chlorpromazine Hydrochloride Tablets contain not less than 95.0 percent and not more than 105.0 percent of the labeled amount of C17H19ClN2S·HCl.
Packaging and storage Preserve in well-closed, light-resistant containers.
USP Reference standards 11
A: Tablets respond to Identification test B under Chlorpromazine Hydrochloride.
B: Digest a quantity of powdered Tablets, equivalent to about 25 mg of chlorpromazine hydrochloride, with 25 mL of water, and filter: the solution so obtained responds to Identification test C under Chlorpromazine Hydrochloride.
Medium: 0.1 N hydrochloric acid; 900 mL.
Apparatus 1: 50 rpm.
Time: 30 minutes.
Procedure Determine the amount of C17H19ClN2S·HCl dissolved from UV absorbances at the wavelength of maximum absorbance at about 254 nm of filtered portions of the solution under test, suitably diluted with Dissolution Medium, in comparison with a Standard solution having a known concentration of USP Chlorpromazine Hydrochloride RS in the same medium.
Tolerances Not less than 80% (Q) of the labeled amount of C17H19ClN2S·HCl is dissolved in 30 minutes.
Uniformity of dosage units 905: meet the requirements.
Other alkylated phenothiazines Transfer a portion of finely powdered Tablets, equivalent to 50 mg of chlorpromazine hydrochloride, to a stoppered centrifuge tube, add 10 mL of methanol, shake vigorously, and centrifuge (remove any sugar coating by prior washing with water). Proceed as directed in the test for Other alkylated phenothiazines under Chlorpromazine, beginning with Dissolve a suitable quantity of USP Chlorpromazine Hydrochloride RS. The area and intensity of any spot, other than the principal spot, from the solution from the Tablets are not greater than those of the spot from the Diluted standard solution (0.5%).
Assay Weigh and finely powder not fewer than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 100 mg of chlorpromazine hydrochloride, to a 500-mL volumetric flask. Add about 200 mL of water and 5 mL of hydrochloric acid, insert the stopper, and shake for about 10 minutes. Dilute with water to volume, and mix. Filter a portion of the solution, discarding the first 50 mL of the filtrate. Treat 10.0 mL of the filtrate as directed in the Assay under Chlorpromazine Hydrochloride Injection, beginning with Pipet 10 mL of the solution. Calculate the quantity, in mg, of C17H19ClN2S·HCl in the portion of Tablets taken by the formula:
12.5C(A254 A277)U / (A254 A277)Sin which C is the concentration, in µg per mL, of USP Chlorpromazine Hydrochloride RS in the Standard solution, and the parenthetic expressions are the differences in the absorbances of the two solutions at the wavelengths indicated by the subscripts, for the solution from the Tablets (U) and the Standard solution (S), respectively.
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USP35NF30 Page 2645