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- W1969849063 abstract "The metabolism and disposition of a suspected human teratogen, trimethadione (TMO), was studied in pregnant rats following administration of the drug at doses of 60 and 240 mg/kg/day during 6 to 15 days of gestion, with a view to understanding the fetotoxicity of the drug. Following the last dose, animals were sacrificed at 6, 12, and 24 hr, and the fetuses were removed by caesarean section. The concentrations of TMO and its N-demethylated metabolite, dimethadione (DMO), were determined by a specific GLC procedure in maternal plasma, urine, brain, and liver, as well as in placenta and whole fetus. The plasma and liver concentrations of TMO and DMO suggested that the parent drug is rapidly converted to DMO. Total 24 hr urinary recoveries of the unchanged drug and the metabolite were 61 and 82% following 240 and 60 mg/kg/day doses of TMO, respectively. The DMO concentrations in brain and all other tissues analyzed were far greater than those of TMO. The fetus to maternal plasma concentration ratios of TMO suggested that the placental transfer of the drug was greater than the clearance from the fetus over the periods examined, whereas the transfer of the metablite seemed to be independent of dose. Furthermore, the rate of decline of DMO in fetus was far slower than that of the placenta and maternal plasma, causing accumulation of DMO in the fetus. The results suggest that the fetotoxic effects produced by TMO when given to pregnant rats could be due to accumulation of DMO in fetus." @default.
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- W1969849063 date "1979-08-01" @default.
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- W1969849063 title "Metabolism and Disposition of Trimethadione in Pregnant Rats" @default.
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- W1969849063 doi "https://doi.org/10.1111/j.1528-1157.1979.tb04822.x" @default.
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