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Hepatotoxicity is a well-known side effect of the antifungal drug 5-fluorocytosine. The underlying mechanisms of this toxicity are unknown. The present in vitro study was, therefore, designed to assess the influence of 5-fluorocytosine and 5-fluorouracil on the hepatic cytochrome P 450 concentration in human and rat liver microsomes. Incubation of human or rat hepatic microsomes for 1 h with 5-fluorocytosine up to 500 micrograms/ml or with 5-fluorouracil up to 200 micrograms/ml did not influence the cytochrome P 450 concentration. In comparison the amount of cytochrome P 450 in human liver, however, was lower than in rat liver microsomes and a more interindividual variation was observed. 相似文献
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