PMID: 2864715Jan 1, 1985

Midazolam cue in rats: generalization tests with anxiolytic and other drugs

H S GarchaI P Stolerman


Some characteristics of the discriminative stimulus (cue) effects of midazolam, a short-acting benzodiazepine, have been determined in rats. A standard two-bar operant conditioning procedure with food reinforcers delivered on a tandem schedule was used. The 0.4 mg/kg dose of midazolam used for training was well discriminated, typically yielding at least 95% correct responding. Other benzodiazepines increased the percentage of drug-appropriate responding in a dose-related manner and were generalized at doses which had little effect on the overall rate of responding. Doses of pentobarbitone which greatly reduced the overall rate of responding were also generalized with midazolam. Amphetamine, oxotremorine, picrotoxin, morphine, nicotine, quipazine and Ro 15-1788 were not generalized, even at doses which severely suppressed overall response rates. The midazolam cue possesses a considerable degree of specificity and provides a potentially useful assay for drug action at the benzodiazepine receptor complex.


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Related Concepts

Dose-Response Relationship, Drug
Generalization, Stimulus
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