Attenuation of mu-opioid tolerance and cross-tolerance by the competitive N-methyl-D-aspartate receptor antagonist LY235959 is related to tolerance and cross-tolerance magnitude.


Although NMDA receptor antagonists attenuate the development of morphine tolerance, it is not clear whether NMDA receptor antagonists also prevent tolerance and cross-tolerance to other mu-opioid agonists and, if so, whether prevention is related to the efficacy of the agonist used to examine tolerance. A rat tail-withdrawal procedure was used to test the… (More)


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