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  • Title: Felbamate in vitro metabolism by rat liver microsomes.
    Author: Adusumalli VE, Wong KK, Kucharczyk N, Sofia RD.
    Journal: Drug Metab Dispos; 1991; 19(6):1135-8. PubMed ID: 1687021.
    Abstract:
    Incubation of [14C]felbamate at 37 degrees C for 60 min with liver microsomes from untreated Sprague-Dawley rats converted 10% of the drug to the p-hydroxy (6%) and 2-hydroxy (4%) metabolites. With microsomes from phenobarbital-pretreated rats, 21% of the drug was metabolized to the p-hydroxy (7.5%) and 2-hydroxy (13.5%) metabolites. With microsomes from felbamate-pretreated rats, up to 25% of drug was metabolized to the p-hydroxy (5%) and 2-hydroxy (20%) metabolites. In addition, a small amount of the monocarbamate metabolite was also present, but no other metabolites were formed. Coincubations of [14C]phenytoin with felbamate had no effect on the metabolism of phenytoin, whereas the amount of [14C]felbamate metabolized in the presence of phenytoin decreased by 30-38%.
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