title: Discriminative stimulus properties of ethosuximide in the pigeon.
abstract: After initial exposure to 80 mg/kg, pigeons trained on a two-key drug discrimination procedure rapidly learned to discriminate 120 mg/kg ethosuximide from saline. When 40-160 mg/kg doses of ethosuximide were administered during generalization tests, the percentage of responses directed to the ethosuximide-appropriate key varied directly with dose. Time-effect determinations revealed that the discriminable properties of ethosuximide were evident as early as 15 min after, and as late as 2 h after, intramuscular injection. The discriminative stimulus properties of ethosuximide failed to generalize to the anticonvulsant compounds clonazepam (0.5-4 mg/kg), methsuximide (25-200 mg/kg), and phenytoin (5-15 mg/kg). Generalization was apparent with certain doses of primidone (250, 300 mg/kg) and mephenytoin (80, 160, 240 mg/kg). The concomitant administration of pentylenetetrazol (5, 10, 20 mg/kg) partially blocked the discriminable properties of the training dose of ethosuximide.
mesh_terms: D000818:Animals; D010856:Columbidae; D004193:Discrimination Learning / Q000187:drug effects; D004192:Discrimination, Psychological / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005013:Ethosuximide / Q000494:pharmacology*; D005795:Generalization, Stimulus / Q000187:drug effects
chemical_list: D005013:Ethosuximide