Chronic opioid antagonist treatment up-regulates opioid receptors and produces functional supersensitivity. Although opioid antagonists vary from neutral to inverse, the role of antagonist efficacy in mediating the chronic effects of opioid antagonists is not known. In this study, the effects of two putative inverse agonists (naltrexone, naloxone) and a putative neutral antagonist (6beta-naltre...

The goal of the present study was to elucidate the relationship between cannabinoid and opioid systems in drug dependence. The CB1 cannabinoid receptor antagonist SR 141716A precipitated both paw tremors and head shakes in four different mouse strains that were treated repeatedly with -tetrahydrocannabinol ( -THC). SR 141716A-precipitated -THC withdrawal was ameliorated in -opioid receptor knoc...

there is growing evidence indicating that neuronal calcium channels play an important role in the mechanism of morphine dependence. in this study, the effects of acute and chronic administration of nitrendipine on naloxone precipitated morphine withdrawal signs were investigated. mice were rendered dependent to morphine by subcutaneous injection of morphine over a period of 5 days. in chronic s...

It is widely believed that opioid withdrawal symptoms contribute to relapse to opioid use, but relapse is highly probable in experienced users even after prolonged abstinence and during opioid maintenance therapy. We have found using an animal model of relapse, the reinstatement procedure, that the two events that reliably reinstate heroin-seeking behavior are reexposure to heroin, and brief ex...

Glucocorticoid hormones evidently affect memory. Morphine withdrawal causes a cognitive deficit and an increase in corticosterone secretion. In the present study brain corticosterone concentrations were determined after morphine withdrawal. Male mice were made dependent by increasing doses of morphine over 3 days. Blood and brain samples were collected following withdrawal induced by injection ...

PURPOSE There are several reports about effects of Salvia spp. on CNS. The present experiment is undertaken to study effect of S. limbata, S. hypoleuca and S. macrosiphon on withdrawal syndrome in mice. METHODS Antinociceptive activities of aerial parts of Salvia spp. is investigated using hot plate method. In addition, the effect of its aerial parts on morphine dependence is investigated in ...

physical disorders can be seen in psychiatric patients. in addition, a delayed diagnosis can cause a serious complication of the physical disorder among such patients. in this report, a case of appendicitis in a psychiatric case with drug withdrawal symptoms was reported.

background: chronic abuse of opiates induces dependency, but the neurobiological mechanisms of this event remain unclear. the aim of this study was to evaluate the effects of intracerebroventricular of venlafaxine on the morphine dependence and pain perception. methods: a total of 80 adult male rats were divided into two major groups: (1) 40 of them was divided into groups of positive control (...

There is growing evidence indicating that neuronal calcium channels play an important role in the mechanism of morphine dependence. In this study, the effects of acute and chronic administration of nitrendipine on naloxone precipitated morphine withdrawal signs were investigated. Mice were rendered dependent to morphine by subcutaneous injection of morphine over a period of 5 days. In chronic s...