PMID: 7955Jul 1, 1976

Stability of frozen solutions of cefazolin sodium

American Journal of Hospital Pharmacy
S M CaroneJ C Boylan

Abstract

The stability of frozen solutions of cefazolin sodium was investigated in nine commonly used diluents at concentrations of 1 g with 2.5 ml, 500 mg with 100 ml and 10 g with 45 ml in both glass and polyvinylchloride plastic containers. The diluents were: Water for Injection USP; 0.9% Sodium Chloride Injection USP; 5% Dextrose Injection USP (D5W); D5W with 0.02% sodium bicarbonate; D5W in Lactated Ringer's Injection USP; Lactated Ringer's Injection USP; Ionosol B in D5W; Normasol M in D5W; and Plasmalyte in D5W. Frozen cefazolin sodium solutions, containing Water for Injection USP, 5% Dextrose Inection USP or 0.9% Sodium Chloride Injection USP as the diluents, retained more than 90% of labeled potency for up to 26 weeks when frozen within one hour after reconstitution and held at -10 C or -20 C. Frozen cefazolin sodium solutions, made with other diluents, were stable for up to four weeks when frozen within one hour after reconstitution and held at -10 C.

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