Conditioning processes contribute to severity of naloxone-precipitated withdrawal from acute opioid dependence

摘要

Single injections with morphine can induce a state of acute opioid dependence in humans and animals, typically measured as precipitated withdrawal when an antagonist such as naloxone is administered 4–24 h after morphine. Repeated treatment with morphine results in further increases in naloxone potency, and prior work has shown that this progressive shift in naloxone potency requires repeated naloxone experience under some but not all experimental conditions.