Although differences in pharmacokinetics were observed between ... vials of extended-release epidural morphine sulfate should be gently inverted or swirled and not vigorously shaken just before ...

Am J Health Syst Pharm. 2009;66(11):1020-1030. The dose of extended-release epidural morphine sulfate (range, 2.5–40 mg) or standard epidural morphine sulfate (5 mg) was administered via ...