title: Some factors controlling oral morphine intake in rats.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D004327:Drinking Behavior / Q000187:drug effects; D006801:Humans; D008297:Male; D009020:Morphine / Q000008:administration & dosage* / Q000494:pharmacology; D009021:Morphine Dependence; D011292:Premedication; D051381:Rats; D012651:Self Medication
chemical_list: D009020:Morphine