Acute tolerance to chlordiazepoxide qualitatively changes the interaction between flumazenil and pregnanolone and not the interaction between flumazenil and midazolam in rhesus monkeys discriminating midazolam11These studies were supported by United States Public Health Service Grant R01 DA009157 and a Senior Scientist Award [Grant K05 DA17918 (CPF)]. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute on Drug Abuse or the National Institutes of Health.