U.S. PHARMACOPEIA

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Cefmetazole Injection
» Cefmetazole Injection is a sterile isoosmotic solution of Cefmetazole and Sodium Citrate in Water for Injection. It contains one or more buffer substances and a tonicity-adjusting agent. It contains not less than 90.0 percent and not more than 120.0 percent of the labeled amount of cefmetazole (C15H17N7O5S3).
Packaging and storage— Preserve in Containers for Injections as described under Injections 1. Maintain in the frozen state.
Labeling— It meets the requirements for Labeling under Injections 1. The label states that it is to be thawed just prior to use, describes the conditions for proper storage of the resultant solution, and directs that the solution is not to be refrozen.
Identification— The retention time of the major peak in the chromatogram of the Assay preparation corresponds to that observed in the chromatogram of the Standard preparation, as obtained in the Assay.
Bacterial endotoxins 85— It contains not more than 0.2 USP Endotoxin Unit per mg of cefmetazole.
Sterility 71— It meets the requirements when tested as directed for Membrane Filtration under Test for Sterility of the Product to be Examined, except to use water instead of Fluid A.
pH 791: between 4.2 and 6.2.
Particulate matter 788: meets the requirements for small-volume injections.
Residual solvents 467: meets the requirements.
(Official January 1, 2007)
Assay—
Mobile phase, Resolution solution, Standard preparation, and Chromatographic system— Proceed as directed in the Assay under Cefmetazole.
Assay preparation— Allow the contents of a container of Injection to thaw, and mix the resultant solution. Transfer an accurately measured volume of this solution, equivalent to about 40 mg of cefmetazole, to a 200-mL volumetric flask, dilute with Mobile phase to volume, and mix. [NOTE—Use this solution within 10 minutes.]
Procedure— Proceed as directed for Procedure in the Assay under Cefmetazole. Calculate the quantity, in mg, of cefmetazole (C15H17N7O5S3) in each mL of the Injection by the formula:
0.2(C / VM)(rU / rS),
in which V is the volume, in mL, of Injection taken to prepare the Assay preparation, and the other terms are as defined therein.
Auxiliary Information— Staff Liaison : Brian D. Gilbert, Ph.D., Scientist
Expert Committee : (MDANT05) Monograph Development-Antibiotics
USP29–NF24 Page 415
Phone Number : 1-301-816-8223