U.S. PHARMACOPEIA

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Nafcillin Injection
» Nafcillin Injection is a sterile isoosmotic solution of Nafcillin Sodium and one or more buffer substances in Water for Injection. It contains dextrose as a tonicity-adjusting agent. It contains an amount of nafcillin sodium equivalent to not less than 90.0 percent and not more than 120.0 percent of the labeled amount of nafcillin (C21H22N2O5S). It contains no antimicrobial preservatives.
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 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 for nafcillin in the chromatogram of the Assay preparation corresponds to that in the chromatogram of the Standard preparation, as obtained in the Assay.
Bacterial endotoxins 85— It contains not more than 0.13 USP Endotoxin Unit per mg of nafcillin.
Sterility 71— It meets the requirements when tested as directed for Membrane Filtration under Test for Sterility of the Product to be Examined.
pH 791: between 6.0 and 8.5.
Particulate matter 788: meets the requirements for small-volume injections.
Residual solvents 467: meets the requirements.
(Official January 1, 2007)
Assay—
Acetic acid solution, 0.05 M Sodium acetate, Diluent, Mobile phase, Standard preparation, Resolution solution, and Chromatographic system— Proceed as directed in the Assay under Nafcillin Sodium.
Assay preparation— Allow one container of Injection to thaw, and mix. Transfer an accurately measured volume of Injection, equivalent to about 40 mg of nafcillin, to a 100-mL volumetric flask, dilute with Diluent to volume, and mix.
Procedure— Proceed as directed for Procedure in the Assay under Nafcillin Sodium. Calculate the quantity, in mg, of nafcillin (C21H22N2O5S) in each mL of the Injection taken by the formula:
0.1(C / V)(rU / rS),
in which C is the concentration, in µg per mL, of nafcillin in the Standard preparation; V is the volume, in mL, of Injection taken to prepare the Assay preparation; and rU and rS are the nafcillin peak responses obtained from the Assay preparation and the Standard preparation, respectively.
Auxiliary Information— Staff Liaison : Brian D. Gilbert, Ph.D., Scientist
Expert Committee : (MDANT05) Monograph Development-Antibiotics
USP29–NF24 Page 1469
Phone Number : 1-301-816-8223