Cyproheptadine Hydrochloride Tablets
» Cyproheptadine Hydrochloride Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of C21H21N·HCl.
Packaging and storage
Preserve in well-closed containers.
USP Reference standards 11
USP Cyproheptadine Hydrochloride RS
Identification
Tablets meet the requirements under IdentificationOrganic Nitrogenous Bases 181.
Dissolution 711
Medium:
0.1 N hydrochloric acid; 900 mL.
Apparatus 2:
50 rpm.
Time:
30 minutes.
Procedure
Determine the amount of C21H21N·HCl dissolved by employing UV absorption at the wavelength of maximum absorbance at about 285 nm on filtered portions of the solution under test, suitably diluted with Dissolution Medium, if necessary, in comparison with a Standard solution having a known concentration of USP Cyproheptadine Hydrochloride RS in the same Medium.
Tolerances
Not less than 80% (Q) of the labeled amount of C21H21N·HCl is dissolved in 30 minutes.
Uniformity of dosage units 905:
meet the requirements.
Assay
Methanesulfonic acid solution
Prepare a solution of methanesulfonic acid in water (3:1000).
Mobile phase
Prepare a filtered and degassed mixture of acetonitrile, isopropyl alcohol, and Methanesulfonic acid solution (20:15:65); while mixing adjust with triethylamine to a pH of 4.0 ± 0.05. Make adjustments if necessary (see System Suitability under Chromatography 621).
Standard preparation
Dissolve an accurately weighed quantity of USP Cyproheptadine Hydrochloride RS in Mobile phase to obtain a solution having a known concentration of about 0.08 mg per mL.
Assay preparation
Transfer a number of Tablets, accurately weighed, equivalent to 80 mg of cyproheptadine hydrochloride, to a 1-liter volumetric flask, dissolve by sonication in 500 mL of Mobile phase for 15 minutes, and agitate for 30 minutes. Dilute with Mobile phase to volume, and mix. Pass through a filter having a 0.45-µm or finer porosity.
Chromatographic system
(see Chromatography 621)The liquid chromatograph is equipped with a 285-nm detector and a 3.9-mm × 15-cm column that contains packing L1. The flow rate is about 1 mL per minute. Chromatograph the Standard preparation, and record the peak responses as directed for Procedure: the tailing factor is not more than 2.5; and the relative standard deviation for replicate injections is not more than 2%.
Procedure
Separately inject equal volumes (about 10 µL) of the Standard preparation and the Assay preparation into the chromatograph, record the chromatograms, and measure the responses for the major peaks. Calculate the quantity, in mg, of C21H21N·HCl in each of the Tablets taken by the formula:
1000(C / N)(rU / rS)
in which C is the concentration, in mg per mL, of USP Cyproheptadine Hydrochloride RS in the Standard preparation; N is the number of Tablets taken for the Assay preparation; and rU and rS are the cyproheptadine peak responses obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information
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USP35NF30 Page 2797
Pharmacopeial Forum: Volume No. 27(2) Page 2136
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