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Updated: Jul 11, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
07:23

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities

Published on: July 29, 2014

Morphine-6-glucuronide (M6G) for postoperative pain relief

Albert Dahan1, Eveline van Dorp, Terry Smith

  • 1Department of Anesthesiology, Leiden University Medical Center, P5-Q, P.O. Box 9600, 2300 RC Leiden, The Netherlands. a.dahan@lumc.nl

European Journal of Pain (London, England)
|September 18, 2007
PubMed

Insights

Morphine-6-glucuronide (M6G) offers effective pain relief comparable to morphine. Studies suggest M6G may reduce opioid side effects like nausea and respiratory depression, indicating potential for improved postoperative pain management.

Area of Science:

  • Pharmacology
  • Pain Management
  • Clinical Trials

Background:

  • Morphine-6-glucuronide (M6G) is an active metabolite of morphine.
  • M6G acts on the mu-opioid receptor.
  • Opioid analgesics are commonly used for postoperative pain but are associated with side effects.

Purpose of the Study:

  • To review the pharmacological properties of M6G.
  • To evaluate the clinical evidence for M6G's efficacy and safety in pain relief.
  • To discuss the potential future role of M6G in managing postoperative pain.

Main Methods:

  • Review of experimental human studies.
  • Analysis of randomized clinical trials.
  • Pharmacological and clinical data assessment.

Main Results:

  • M6G provides pain relief comparable to morphine.
  • Evidence suggests M6G may reduce postoperative nausea and vomiting (PONV).
  • M6G appears to cause less respiratory depression than morphine.

Conclusions:

  • M6G demonstrates significant efficacy and a potentially favorable safety profile for postoperative pain.
  • M6G may offer an alternative opioid analgesic with reduced side effect burden.
  • Further research and clinical application of M6G in postoperative pain management are warranted.

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