1. Ann Pharm Fr. 2011 Nov;69(6):296-301. Epub 2011 Oct 29. Long-term stability of temocillin in dextrose 5% and in sodium chloride 0.9% polyolefin bags at 5±3°C after freeze-thaw treatment. Rolin C, Hecq JD, Tulkens P, Vanbeckbergen D, Jamart J, Galanti L. Medical Laboratory, CHU Mont-Godinne, Catholic university of Louvain, 1, avenue Therasse, 5530 Yvoir, Belgium. INTRODUCTION: The aim of this study was to investigate the stability of a mixture of temocillin 20mg/ml in 5% dextrose and in 0.9% sodium chloride polyolefin bags after freezing, microwave thawing and long-term storage at 5±3°C. METHODS: The stability of ten polyolefin bags containing 20mg/ml of temocillin, five bags in 5% dextrose and five bags in 0.9% sodium chloride, prepared under aseptic conditions was studied after freezing for 1 month at -20°C, thawing in a microwave oven with a validated cycle, and stored at 5±3°C. Over 30 days, temocillin concentrations were measured by high-pressure liquid chromatography. Visual inspections, microscope observation, spectrophotometric measurements and pH measurements were also performed. RESULTS AND DISCUSSION: No precipitation occurred in the preparations but minor colour change was observed. No microaggregate was observed with optical microscopy or revealed by a change of absorbance. Based on a shelf life of 95% residual potency, temocillin infusions were stable at least 11 days in 5% dextrose and 14 days in 0.9% sodium chloride after freezing and microwave thawing (corresponding at the period where 95% lower confidence limit of the concentration-time profile remained superior to 95% of the initial concentration). During this period, the pH values of drug solutions have been observed to decrease without affecting chromatographic parameters. CONCLUSION: Within these limits, temocillin in 5% dextrose and in 0.9% sodium chloride infusions may be prepared and frozen in advance by a centralized intravenous admixture service then thawed before use in clinical units. Copyright © 2011 Elsevier Masson SAS. All rights reserved. PMID: 22115132 [PubMed - in process]