title: Absorption of 14C-labeled methadone by portal and extraportal venous circulations following intraperitoneal and intraduodenal administration.
mesh_terms: D000042:Absorption; D000818:Animals; D004386:Duodenum; D007267:Injections; D007274:Injections, Intraperitoneal; D007408:Intestinal Absorption; D007700:Kinetics; D008297:Male; D008691:Methadone / Q000008:administration & dosage / Q000378:metabolism*; D011169:Portal Vein; D051381:Rats; D014680:Veins
chemical_list: D008691:Methadone