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- W2056009743 abstract "Previous research suggests that intrinsic efficacy of benzodiazepines is an important determinant of their behavioral effects. We evaluated the reinforcing effects of the benzodiazepine partial agonist bretazenil using behavioral economic models referred to as “consumer demand” and “labor supply”. Four rhesus monkeys were trained under a progressive-ratio (PR) schedule of i.v. midazolam injection. A range of doses of bretazenil (0.001–0.03 mg/kg/injection and vehicle) was evaluated for self-administration with an initial response requirement of 40 that doubled to 640; significant self-administration was maintained at doses of 0.003–0.03 mg/kg/injection. Next, a dose of bretazenil that maintained peak injections/session was made available with initial response requirements doubling from 10 to 320 (maximum possible response requirements of 160 and 5120, respectively), and increasing response requirements decreased self-administration (mean number of injections/session) of a peak dose (0.01 mg/kg/injection). Analyses based on consumer demand revealed that a measure of reinforcing strength termed “essential value”, for bretazenil was similar to that previously obtained with midazolam (non-selective full agonist), but less than that observed for zolpidem (full agonist, selective for α1 subunit-containing GABAA receptors). According to labor supply analysis, the reinforcing effects of bretazenil were influenced by the economic concept referred to as a “price effect”, similar to our previous findings with midazolam but not zolpidem. In general, behavioral economic indicators of reinforcing effectiveness did not differentiate bretazenil from a non-selective full agonist. These findings raise the possibility that degree of intrinsic efficacy of a benzodiazepine agonist may not be predictive of relative reinforcing effectiveness." @default.
- W2056009743 created "2016-06-24" @default.
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- W2056009743 date "2011-01-01" @default.
- W2056009743 modified "2023-10-14" @default.
- W2056009743 title "Self-administration of bretazenil under progressive-ratio schedules: Behavioral economic analysis of the role intrinsic efficacy plays in the reinforcing effects of benzodiazepines" @default.
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- W2056009743 doi "https://doi.org/10.1016/j.drugalcdep.2010.07.019" @default.
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