Attempted reversal of cocaine-induced antinociceptive effects with naloxone, an opioid antagonist.

Abstract

We attempted to reverse the behavioral and neuronal antinociceptive effects of cocaine with naloxone, an opioid antagonist. Cocaine (20 mg/kg i.p.) produced a strong analgesic effect in the formalin test and in the tail pinch test. These cocaine-induced analgesic effects could be reversed by naloxone at a very high dose (10 mg/kg) but not at a dose (1 mg/kg… (More)

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