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  • Title: Simultaneous determination of the phase II metabolites of the non steroidal anti-inflammatory drug etodolac in human urine.
    Author: Berendes U, Blaschke G.
    Journal: Enantiomer; 1996; 1(4-6):415-22. PubMed ID: 9676278.
    Abstract:
    Etodolac, an antirheumatic and analgetic drug, is metabolized in humans by hydroxylation and acyl glucuronidation to yield the corresponding 1-O-glucuronides. The acylglucuronides of etodolac and one of its hydroxylated metabolites were determined by HPLC using a RP18 column. In order to increase the lipophilicity of these metabolites the hydroxy groups were acetylated and the carboxylic functions were methylated. In a study with five human volunteers a stereoselective excretion of the acylglucuronides could be observed. The S-etodolac-glucuronide is mainly excreted during the first 6 hours after administration of 400 mg of etodolac whereas the elimination of the R-glucuronide predominates at longer periods of time. The S-glucuronide of 7-hydroxy-etodolac was preferenetively excreted during the period of time observed. An unknown metabolite of etodolac could be characterized by chemical and enzymatically hydrolysis and by MS and NMR.
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