title: A comparative study of the action of demerol and opium alkaloids in relation to biliary spasm.
mesh_terms: D000470:Alkaloids; D005767:Gastrointestinal Diseases; D008614:Meperidine; D009892:Opium; D013035:Spasm
chemical_list: D000470:Alkaloids; D009892:Opium; D008614:Meperidine
keywords: DEMEROL; OPIUM/alkaloids