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1. In Sprague-Dawley (SD) rats treated for 7 days with malotilate (MAL:250 mg/kg, p.o.), cytochrome P-450 and b5 contents, aminopyrine N-demethylase and heme oxygenase activities were significantly increased. In Wistar rats, cytochrome b5 content and heme oxygenase and delta-aminolevulinic acid synthetase activities were found to be significantly increased. 2. Among the antipyrine metabolites excreted in urine during the 24 hr after antipyrine (100 mg/kg, i.p.) administration, norantipyrine increased significantly in Sprague-Dawley rats, while a significant increase of 4-hydroxyantipyrine was observed in Wistar rats. 3. The serum dimethadione/trimethadione ratio was only found to be significantly increased in Sprague-Dawley rats. 4. These results indicate that malotilate may have inducible effects on hepatic drug metabolizing enzymes, and that it affects the various cytochrome P-450 isozymes from different strains of rat in different ways.
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