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Opioid induced constipation: mechanisms and management.

Erica Becker1, Mahmoud Y Madi1, Mary Magee1

  • 1Division of Gastroenterology and Hepatology, Department of Internal Medicine, Saint Louis University School of Medicine, St. Louis, MO, United States.

Postgraduate Medical Journal
|December 15, 2025
PubMed
Summary

Opioid-induced constipation (OIC) significantly impacts chronic pain patients. Early patient education and tailored laxative use are key, with peripherally acting mu-opioid receptor antagonists as effective second-line treatments.

Keywords:
adult gastroenterologydisordersfunctional bowelgastroenterologymotility disorders

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Area of Science:

  • Gastroenterology
  • Pharmacology
  • Pain Management

Background:

  • Opioid-induced constipation (OIC) is a common side effect of opioid analgesics.
  • OIC negatively impacts patient quality of life and reduces opioid efficacy.
  • It is often underdiagnosed and inadequately managed in clinical practice.

Purpose of the Study:

  • To review the pathophysiology, clinical evaluation, and evidence-based management of OIC.
  • To provide practical recommendations for clinicians managing OIC.
  • To highlight the integration of mechanistic insights with clinical guidance for OIC.

Main Methods:

  • Comprehensive literature search of MEDLINE and EMBASE (2000-April 2025).
  • Analysis of relevant studies, meta-analyses, and consensus statements.
  • Synthesis of mechanistic insights and practical recommendations for OIC management.

Main Results:

  • OIC results from mu-opioid receptor activation in the GI tract, slowing motility.
  • Initial management involves patient education and over-the-counter laxatives.
  • Peripherally acting mu-opioid receptor antagonists are effective second-line options but underutilized.

Conclusions:

  • Proactive patient education and tailored laxative therapy are essential for OIC management.
  • Regular monitoring using tools like the Bowel Function Index is crucial.
  • Addressing access barriers and clinician awareness is needed to improve the use of advanced OIC therapies.