title: Tolerance to suppressive effects of chlordiazepoxide on operant behavior: lack of cross tolerance to pentobarbital.
abstract: Pigeons responded under schedules in which either the 60th response (fixed-ratio schedule) or the first response after 3 minutes (fixed-interval schedule) resulted in food delivery. The effects of chlordiazepoxide HCl (1-30 mg/kg) and pentobarbital sodium (1-17 mg/kg) were determined before and during chronic daily exposure to either 10 or 17 mg/kg chlordiazepoxide--doses that markedly suppressed responding when given acutely. After about three weeks of daily injections of chlordiazepoxide, there was at least a three-fold shift to the right of the dose-effect curve for chlordiazepoxide, but not consistent change in the effects of pentobarbital.
mesh_terms: D000818:Animals; D002707:Chlordiazepoxide / Q000008:administration & dosage / Q000494:pharmacology*; D010856:Columbidae; D003216:Conditioning, Operant / Q000187:drug effects*; D004361:Drug Tolerance; D008297:Male; D010424:Pentobarbital / Q000008:administration & dosage / Q000494:pharmacology*; D012055:Reinforcement Schedule
chemical_list: D002707:Chlordiazepoxide; D010424:Pentobarbital