title: Drug discrimination: no evidence for tolerance to opiates.
authors: Centre de Recherche Pierre Fabre, Castres, France.
authors: F C
authors: FC
authors: Colpaert
mesh_terms: D000818:Animals; D004193:Discrimination Learning / Q000187:drug effects*; D004361:Drug Tolerance; D009294:Narcotics / Q000494:pharmacology*
chemical_list: D009294:Narcotics