Attenuation of the discriminative stimulus effects of ethanol by the benzodiazepine partial inverse agonist Ro 15-4513

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The aim of tile present study was to investigate whether ethanol training affects the ability of Ro 15-4513 to block the discriminative stimulus effects of ethanol dose differentially. Three different groups of rats were trained to discriminate 1.0 g/kg ethanol (n = 8), 1.5 g/kg ethanol (n = 7) or 2.0 g/kg ethanol (n = 8) from water in a two-lever, food-reinforced procedure. Ethanol and mater were administered by gavage 20 min before the onset of the session. When the discrimination performance was stable, rats were pretreated with Ro 15-4513 (1-17 mg/kg; i.p.) 5 min before the administration of ethanol. Ro 15-4513 attenuated the discriminative stimulus effects of 1.0 and 1.5 g/kg ethanol but not 2.0 g/kg ethanol in each of the ethanol training groups. Overall, blockade of the discriminative stimulus effects of 1.0 and 1.5 g/kg ethanol by 5.6 mg/kg Ro 15-4513 occurred without significantly altering response rates or blood ethanol concentrations. A decrease in blood ethanol concentration was, however, found with 17 mg/kg Ro 15-4513 in combination with 2.0 g/kg ethanol. These results suggest that the benzodiazepine partial inverse agonist, Ro 15-4513, can attenuate the discriminative stimulus effects associated,cith low to moderate doses of ethanol (1.0-1.5 g/kg).

Original languageEnglish (US)
Pages (from-to)139-146
Number of pages8
JournalBehavioural Pharmacology
Issue number2-3
Publication statusPublished - 1997
Externally publishedYes



  • Benzodiazepine inverse agonist
  • Drug discrimination
  • Ethanol
  • Rat
  • Ro 15-4513

ASJC Scopus subject areas

  • Pharmacology
  • Neuroscience(all)

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