The narcotic cueing activity of sufentanil, fentanyl, morphine and met-enkephalin was studied upon their injection into the lateral brain ventricle of the rat. Comparative studies on the analgesic activity of the three narcotics support a close correlation between the narcotic cueing and the analgesic activity of narcotic drugs.

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http://dx.doi.org/10.1016/0014-2999(78)90381-3DOI Listing

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