Re: Methadone and Stadol
Nubain and Stadol are agonist/antagonists. They act like narcan at the mu receptor (analgesia, euphoria, respiratory depression, itching are the main effects of activation of this receptor) while acting as an agonist at the kappa receptors (analgesia, sedation, occasional dysphoria). Most opioid addicts are using pure opioid agonists that act at both mu and kappa receptors. This is why opioid dependent patients experience immediate withdrawal when receiving nubain or stadol IV. This also explains why administering small doses of nubain after epidural or intrathecal fentanyl or morphine is more effective for the itching (a mu mediated effect) than benadryl (an antihistamine...the itching associated with opioids is rarely associated with histamine release).
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