title: A technique for chronic intragastric drug administration in the rat.
mesh_terms: D000818:Animals; D001835:Body Weight; D002404:Catheterization / Q000295:instrumentation / Q000662:veterinary; D003216:Conditioning, Operant / Q000187:drug effects; D005260:Female; D007441:Intubation, Gastrointestinal / Q000295:instrumentation / Q000662:veterinary*; D008691:Methadone / Q000494:pharmacology; D051381:Rats; D012055:Reinforcement Schedule; D013270:Stomach; D013997:Time Factors
chemical_list: D008691:Methadone