Doripenem 5- and 10-mg/mL solutions were stable for 24 hours at 25 degrees C when diluted in 0.9% sodium chloride injection. When diluted in 5% dextrose injection, the stability of both concentrations of doripenem decreased to 16 hours at 25 degrees C. When stored at 4 degrees C, 5-mg/mL solutions in either 0.9% sodium chloride or 5% dextrose injection were stable for at least 10 days, and all solutions containing doripenem 10 mg/mL were stable for at least 7 days. Both concentrations of doripenem were stable for 16 hours when previously frozen and thawed at 25 degrees C and 4 degrees C. The rate of doripenem degradation was similar between PVC and elastomeric containers.