Dose-dependent biliary and renal excretion of paracetamol in the rat.
In rats, the biliary and renal excretion of paracetamol changed in a dose-dependent manner. After an oral nonhepatotoxic dose of 200 mg/kg paractamol, the drug excreted in the bile amonted to only 5.5% within 24 h, whereas 72% of the dose were excreted into the urine. Following an oral hepatoxic dose (1,000 mg/kg), the biliary excretion of thotal paracetamol was enhanced to 13.5% whereas the renal elimination was reduced to 51% of the dose. After a nontoxic intravenous treatment with paracetamol (25-100-400 mg/kg), both the excretion of paracetamol conjugates into the bile and the elimination of free paracetamol into the urine were augmented in a dose-dependent manner. Hepatic damage due to carbon tetrachloride pretreatment (0.5 ml/kg i.p. 24 h before 100 mg/kg paracetamol i.v.) diminished both the bile flow and the biliary excretion of paracetamol conjugates, whereas the renal elimination was not affected.
D000082:Acetaminophen / Q000008:administration & dosage / Q000378:metabolism* / Q000633:toxicity; D000284:Administration, Oral; D000818:Animals; D001646:Bile / Q000378:metabolism*; D002252:Carbon Tetrachloride Poisoning / Q000378:metabolism; D056486:Chemical and Drug Induced Liver Injury / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D007275:Injections, Intravenous; D007668:Kidney / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D051381:Rats
D000082:Acetaminophen