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Endogenous Opioids And The Placebo Effect

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Endogenous opioids are largely involved with the placebo effect, in which a patient expects an improvement in their clinical status, and can result in the reduction of pain without any real treatment. One of the main ideas behind this phenomenon is the concept of expectation, which is a top down regulation of pain. An increase in endogenous opioids can act upon the ON/OFF cells in the RVM, which can in effect turn “off” the pain signal, or dampen it dramatically, hence the use of opioids as pain killers. Proving the presence of opioids within the placebo mechanism was determined by using an opioid antagonist naloxone3, which was able to reduce the placebo effect if there were strong expectation cues, but not as effectively when the expectation

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