Opioid-induced hyperalgesia

You don't need to be Editor-In-Chief to add or edit content to WikiDoc. You can begin to add to or edit text on this WikiDoc page by clicking on the edit button at the top of this page. Next enter or edit the information that you would like to appear here. Once you are done editing, scroll down and click the Save page button at the bottom of the page.

Opioid-induced hyperalgesia^[1] or opioid-induced abnormal pain sensitivity^[1] is a phenomenon associated with the long term use of opioids such as morphine, hydrocodone, oxycodone, and methadone. Over time, individuals taking opioids can develop an increasing sensitivity to noxious stimuli, even evolving a painful response to previously non-noxious stimuli. Some studies on animals have also demonstrated this effect occurring after only a single high dose of opioids.^[1] The need for dose escalation in opioid therapy may be as a result of tolerance, as a result of opioid-induced hyperalgesia, or, more likely, a combination of both. Thus patients receiving medications to relieve pain may paradoxically have more pain as a result of their medication.

This phenomenon likely results from changes in NMDA receptors in the dorsal horn of the spinal cord. Research on the mechanisms underlying this phenomenon is ongoing, as are attempts to identify NMDA receptor antagonists, which may be able to prevent or attenuate this effect.

If an individual is taking opioids for a chronic non-cancer pain condition, and requires increasing doses, yet still do not achieve pain relief, they may be experiencing opioid-induced hyperalgesia. If so, they may benefit from complete withdrawal from opioid therapy. Many individuals report reduced pain levels when opioids are withdrawn.^[1]

References

WikiDoc Help Menu Quick Start.. Get Started Here! How to Login How to Search Pages How to Start a New Page How to Edit a Page Cheat Sheet Editing basics Learning Basic Formatting How to make Links in WikiDoc & to External Sites How to Make Lists How to Ignoring Formatting Adding References or Footnotes to Articles Tracking Changes You Have Made How to Put an Article Into a Category When Multiple Topics Should Go To The Same Page (MI, Acute MI, AMI) Using Redirection Advanced editing How to Make Tables How to Insert Images and Other Media How to Add Video Help:How to Make Columns Web Colors How To Make Templates How to Move Pages Inserting Dynamic Dates and Times Inserting WikiDoc Statistics Editing the Table of Contents Communicating your edits Let others know what you changed: The importance of Edit Summaries Minor Edits Edit Conflicts Help Videos You Can Watch Getting Started Video

Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .