Extended Stability of Isoproterenol Hydrochloride Injection in Polyvinyl Chloride Bags Stored in Amber Ultraviolet Light Blocking Bags.

Purpose: Evaluate the stability of isoproterenol hydrochloride injection in 0.9% sodium chloride in polyvinyl chloride bags for up to 90 days. Methods: Dilutions of isoproterenol hydrochloride injection to a concentration of 4 μg/mL were performed under aseptic conditions. The bags were stored in amber ultraviolet light blocking bags at room temperature (23°C-25°C) or under refrigeration (3°C-5°C). Three samples of each preparation and storage environment were analyzed on days 0, 2, 14, 30, 45, 60, and 90. Physical stability was performed by visual examination. The pH was assessed at baseline, each analysis day, and upon final degradation evaluation. Sterility of the samples was not assessed. Chemical stability of isoproterenol hydrochloride was evaluated using liquid chromatography with tandem mass spectrometry. Samples were considered stable if there was <10% degradation of the initial concentration. Results: Isoproterenol hydrochloride diluted to 4 μg/mL with 0.9% sodium chloride injection was physically stable throughout the study. No precipitation was observed. At days 2, 14, 30, 45, 60, and 90 all bags diluted to 4 μg/mL had <10% degradation when stored under refrigeration (3°C-5°C) or stored at room temperature (23°C-25°C). Conclusion: Isoproterenol hydrochloride diluted to a concentration of 4 μg/mL with 0.9% sodium chloride for injection in ultraviolet light blocking bags was stable for 90 days at room temperature and under refrigeration.