MSIR® is a brand name of oral morphine sulfate currently manufactured by Purdue Pharma. MSIR stands for "Morphine Sulfate Instant Release". It is pronouced "em-es-eye-ar." Roxanol® is a brand name of a concentrated oral morphine solution manufactured by Elan Pharmaceuticals. These drugs are often prescribed for patients with chronic pain (e.g., from terminal cancer) who are already taking extended-release formulations of morphine or other opioids, such as Kadian or MS Contin, but require a ...
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