Abstract
Morphine-dependent rats were divided into two subgroups. The first was allowed to develop a spontaneous withdrawal syndrome which was still present 33 h after the last morphine administration. The second subgroup received five injections of naltrexone. While the first two injections of naltrexone precipitated a marked somatic withdrawal syndrome, subsequent naltrexone failed to worsen the somatic signs. 24 h after the last morphine administration, naltrexone was completely ineffective. It is concluded that naltrexone shortens the duration of the morphine somatic withdrawal signs in dependent rats.
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