• Curr Pain Headache Rep · Feb 2006

    Review

    Opioid-induced abnormal pain sensitivity.

    • Jianren Mao.
    • MGH Pain Center, Department of Anesthesia and Critical Care, Massachusetts General Hospital, Boston, 02114, USA. jmao@partners.org
    • Curr Pain Headache Rep. 2006 Feb 1; 10 (1): 67-70.

    AbstractOpioid analgesics are effective for treating many pain conditions. Opioid analgesic tolerance is a pharmacologic phenomenon that could affect the clinical use of opioid analgesics. Recent studies have shown that neural plasticity associated with the development of opioid tolerance may activate a pronociceptive mechanism that could counteract the analgesic effects of opioids. Thus, exposure to opioids could lead to two seemingly unrelated cellular processes (ie, the development of opioid tolerance and opioid-induced pain sensitivity). Their converging effects may be part of the mechanisms leading to the reduced opioid analgesic efficacy in chronic opioid therapy.

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