Diazepam 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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Diazepam Tablets contain not less than 90.0 percent and not more than 110.0 percent of the labeled amount of diazepam (C₁₆H₁₃ClN₂O).

1 Packaging and storage

Preserve in tight, light-resistant containers.

2 USP Reference standards 〈11〉

USP Diazepam RS

USP Nordazepam RS

7-Chloro-1,3-dihydro-5-phenyl-2H-1,4-benzodiazepin-2-one.

C₁₅H₁₁ClN₂O 270.72

3 Identification

A: The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that of the Standard preparation, as obtained in the Assay.

B: Accurately weigh an amount of Tablet mass, equivalent to 10 mg of diazepam, place in a 50-mL centrifuge tube, and add 2 mL of acetone. Place the centrifuge tube in an ultrasonic bath for 5 minutes, and centrifuge. Using 100 µL of the supernatant as the test solution, 100 µL of a solution of USP Diazepam RS in acetone containing 5 mg per mL as the Standard solution, and a solvent system consisting of equal volumes of ethyl acetate and n-heptane, proceed as directed in Identification test B under Diazepam. The specified result is observed.

3.1 Dissolution 〈711〉

Medium: 0.1 N hydrochloric acid; 900 mL.

Apparatus 1: 100 rpm.

Time: 30 minutes.

Procedure - Determine the amount of C₁₆H₁₃ClN₂O dissolved by employing UV absorption at a wavelength of about 242 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 Diazepam RS in the same Medium.

Tolerances - Not less than 85% (Q) of the labeled amount of C₁₆H₁₃ClN₂O is dissolved in 30 minutes.

3.2 Uniformity of dosage units 〈905〉

Meet the requirements.

4 Assay

Mobile phase, System suitability solution, Standard preparation, and Chromatographic system-Prepare as directed in the Assay under Diazepam.

Assay preparation-Weigh and finely powder not less than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 10 mg of diazepam, to a 100-mL volumetric flask. Add about 50 mL of methanol, sonicate for 5 minutes, shake by mechanical means for 5 minutes, dilute with methanol to volume, mix, and filter, discarding the first few mL of the filtrate.

Procedure-Proceed as directed for Procedure in the Assay under Diazepam. Calculate the quantity, in mg, of diazepam (C₁₆H₁₃ClN₂O) in the portion of Tablets taken by the formula:

100C(rᵤ/rₛ)

in which C is the concentration, in mg per mL, of USP Diazepam RS in the Standard preparation, and rᵤ and rₛ are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.