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  • Title: Dose-dependent biliary and renal excretion of paracetamol in the rat.
    Author: Siegers CP, Schütt A.
    Journal: Pharmacology; 1979; 18(4):175-9. PubMed ID: 461496.
    Abstract:
    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.
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