Cefuroxime compatibility and stability

# Intramuscular
When constituted as directed with Sterile Water for Injection, suspensions of ZINACEF for IM injection maintain satisfactory potency for 24 hours at room temperature and for 48 hours under refrigeration (5C).
After the periods mentioned above any unused suspensions should be discarded.

# Intravenous
When the 750-mg, 1.5-g, and 7.5-g pharmacy bulk vials are constituted as directed with Sterile Water for Injection, the solutions of ZINACEF for IV administration maintain satisfactory potency for 24 hours at room temperature and for 48 hours (750-mg and 1.5-g vials) or for 7 days (7.5-g pharmacy bulk vial) under refrigeration (5C). More dilute solutions, such as 750 mg or 1.5 g plus 100 mL of Sterile Water for Injection, 5% Dextrose Injection, or 0.9% Sodium Chloride Injection, also maintain satisfactory potency for 24 hours at room temperature and for 7 days under refrigeration.
These solutions may be further diluted to concentrations of between 1 and 30 mg/mL in the following solutions and will lose not more than 10% activity for 24 hours at room temperature or for at least 7 days under refrigeration: 0.9% Sodium Chloride Injection; 1/6 M Sodium Lactate Injection; Ringer's Injection, USP; Lactated Ringer's Injection, USP; 5% Dextrose and 0.9% Sodium Chloride Injection; 5% Dextrose Injection; 5% Dextrose and 0.45% Sodium Chloride Injection; 5% Dextrose and 0.225% Sodium Chloride Injection; 10% Dextrose Injection; and 10% Invert Sugar in Water for Injection.
Unused solutions should be discarded after the time periods mentioned above.
ZINACEF has also been found compatible for 24 hours at room temperature when admixed in IV infusion with heparin (10 and 50 U/mL) in 0.9% Sodium Chloride Injection and Potassium Chloride (10 and 40 mEq/L) in 0.9% Sodium Chloride Injection. Sodium Bicarbonate Injection, USP is not recommended for the dilution of ZINACEF.
The 750-mg and 1.5-g ZINACEF ADD-Vantage vials, when diluted in 50 or 100 mL of 5% Dextrose Injection, 0.9% Sodium Chloride Injection, or 0.45% Sodium Chloride Injection, may be stored for up to 24 hours at room temperature or for 7 days under refrigeration.

# Frozen Stability
Constitute the 750-mg, 1.5-g, or 7.5-g vial as directed for IV administration in Table 3. Immediately withdraw the total contents of the 750-mg or 1.5-g vial or 8 or 16 mL from the 7.5-g bulk vial and add to a Baxter VIAFLEXMINI-BAGTM containing 50 or 100 mL of 0.9% Sodium Chloride Injection or 5% Dextrose Injection and freeze. Frozen solutions are stable for 6 months when stored at -20C. Frozen solutions should be thawed at room temperature and not refrozen. Do not force thaw by immersion in water baths or by microwave irradiation. Thawed solutions may be stored for up to 24 hours at room temperature or for 7 days in a refrigerator.
Note: Parenteral drug products should be inspected visually for particulate matter and discoloration before administration whenever solution and container permit.
As with other cephalosporins, ZINACEF powder as well as solutions and suspensions tend to darken, depending on storage conditions, without adversely affecting product potency.
Directions for Dispensing
Pharmacy Bulk PackageNot for Direct Infusion
The pharmacy bulk package is for use in a pharmacy admixture service only under a laminar flow hood. Entry into the vial must be made with a sterile transfer set or other sterile dispensing device, and the contents dispensed in aliquots using aseptic technique. The use of syringe and needle is not recommended as it may cause leakage (see DOSAGE AND ADMINISTRATION). AFTER INITIAL WITHDRAWAL USE ENTIRE CONTENTS OF VIAL PROMPTLY. ANY UNUSED PORTION MUST BE DISCARDED WITHIN 24 HOURS.