Cyproheptadine Hydrochloride Tablets

This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition

Issued and maintained by the United States Pharmacopeial Convention (USP)

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>> Cyproheptadine Hydrochloride Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of C₂₁H₂₁N · HCI.

Packaging and storage - Preserve in well-closed containers.

1 USP REFERENCE STANDARDS (11)-

USP Cyproheptadine Hydrochloride RS

Identification - Tablets meet the requirements under Identification-Organic Nitrogenous Bases (181).

2 DISSOLUTION (711)-

Medium: 0.1 N hydrochloric acid; 900 mL.

Apparatus 2: 50 rpm.

Time: 30 minutes.

Procedure-Determine the amount of C₂₁H₂₁N · HCI 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 · HCI is dissolved in 30 minutes.

UNIFORMITY OF DOSAGE UNITS (905): meet the requirements.

3 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 x 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 · HCI in each of the Tablets taken by the formula:

                 1000(C/N)(r_U/r_S)

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 r_U and r_S are the cyproheptadine peak responses obtained from the Assay preparation and the Standard preparation, respectively.