Clomiphene Citrate Tablets
» Clomiphene Citrate Tablets contain not less than 93.0 percent and not more than 107.0 percent of the labeled amount of C26H28ClNO·C6H8O7.
Packaging and storage— Preserve in well-closed containers, protected from light.
USP Reference standards 11
USP Clomiphene Citrate RS Click to View Structure
USP Clomiphene Related Compound A RS Click to View Structure
(E,Z)-2-[4-(1,2-Diphenylethenyl)phenoxy]-N,N-diethylethanamine hydrochloride.
    C26H29NO·HCl    407.98
Identification— Place a portion of finely powdered Tablets, equivalent to about 30 mg of clomiphene citrate, in a centrifuge tube containing about 30 mL of a 1 in 2 solution of methanol in 0.1 N hydrochloric acid. Insert the stopper, and place the tube in a water bath at about 37 for 15 minutes. Shake occasionally. Centrifuge, and place the clear supernatant in a separator. Extract with one 40-mL and two 25-mL portions of hexanes, and discard the extract. Render the aqueous solution alkaline with 1 N sodium hydroxide, and extract the precipitated base with one 50-mL and two 25-mL portions of hexanes. Wash the combined extracts with two portions of water. Dry the extract with anhydrous sodium sulfate, and remove the hexanes by evaporation under reduced pressure. Add about 1.0 mL of carbon disulfide to the residue, and dissolve. Determine the absorption spectra of the test solution and of a Standard solution of USP Clomiphene Citrate RS, similarly prepared, as directed under Identification—Organic Nitrogenous Bases 181.
Dissolution 711
Medium: water; 900 mL.
Apparatus 1: 100 rpm.
Time: 30 minutes.
Procedure— Determine the amount of C26H28ClNO·C6H8O7 dissolved from UV absorbances at the wavelength of maximum absorbance at about 232 nm of filtered portions of the solution under test, suitably diluted with 0.1 N hydrochloric acid, in comparison with a Standard solution having a known concentration of USP Clomiphene Citrate RS in the same medium.
Tolerances— Not less than 75% (Q) of the labeled amount of C26H28ClNO·C6H8O7 is dissolved in 30 minutes.
Uniformity of dosage units 905: meet the requirements.
Mobile phase, Standard preparation, System suitability solution, and Chromatographic system— Proceed as directed in the Assay under Clomiphene Citrate.
Assay preparation— Weigh and finely powder not less than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 50 mg of clomiphene citrate, to a 100-mL volumetric flask. Add about 50 mL of Mobile phase, and stir using a magnetic bar for about 30 minutes. Remove the magnetic bar from the flask, dilute with Mobile phase to volume, mix, and filter. Transfer 10.0 mL of this solution to a 100-mL volumetric flask, dilute with Mobile phase to volume, mix, and filter, discarding the first 10 mL. [note—This solution is stable for at least 24 hours. ]
Procedure— Separately inject equal volumes (about 50 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 C26H28ClNO·C6H8O7 in the portion of Tablets taken by the formula:
1000C(rU / rS)
in which C is the concentration, in mg per mL, of USP Clomiphene Citrate RS in the Standard preparation; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information— Please check for your question in the FAQs before contacting USP.
Topic/Question Contact Expert Committee
Monograph Domenick Vicchio, Ph.D.
Senior Scientific Liaison
(SM42010) Monographs - Small Molecules 4
Reference Standards RS Technical Services
711 Margareth R.C. Marques, Ph.D.
Senior Scientific Liaison
(GCDF2010) General Chapters - Dosage Forms
USP35–NF30 Page 2721