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Years' worth of observations suggest that morphine has both inhibitory and excitatory actions, and that selective blockade of excitatory effects by low doses of opioid antagonists (e.g., naltrexone) may paradoxically enhance morphine analgesia. The purpose of this pilot study was to evaluate and compare the analgesic efficacy and safety of two different low doses of oral naltrexone given in addition to chronic intrathecal morphine infusions in patients with chronic nonmalignant pain (CNMP).

journal of opioid management

Oral naltrexone to enhance analgesia in patients receiving continuous intrathecal morphine for chronic pain: A randomized, double-blind, prospective pilot study