MSIR

Medical abbreviation · Drug

MSIR stands for Morphine sulfate immediate release, a drug abbreviation.

Short-acting oral morphine tablets or solution used for acute pain and for breakthrough pain in patients on long-acting opioids. Effects begin within about 30 minutes and last about 4 hours.

Example: MSIR 15 mg PO q4h PRN breakthrough pain; continue MS Contin 30 mg q12h.

Usage notes

The abbreviation persists because it distinguishes immediate-release morphine from extended-release forms such as MS Contin. Because "MS" is on The Joint Commission "Do Not Use" list, many hospitals require "morphine IR" or "morphine immediate-release" in orders. Oral morphine solution comes in 2 mg/mL and 20 mg/mL strengths, a known source of overdoses.

Related abbreviations

More drug abbreviations

• MgSO4 – Magnesium sulfate
• MME – Morphine milligram equivalents
• MMF – Mycophenolate mofetil
• MMI – Methimazole
• MOM – Milk of magnesia
• MS – Morphine sulfate
• MSO4 – Morphine sulfate
• MTX – Methotrexate
• MVI – Multivitamin infusion
• N2O – Nitrous oxide
• NAC – N-acetylcysteine
• NE – Norepinephrine

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Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.

This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.