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Pursuing oral administration of radiolabeled zafirlukast to volunteers, urinary excretion accounts for about 10% of your dose and the remainder is excreted in feces. Zafirlukast just isn't detected in urine.Zafirlukast is extensively hepatically metabolized by an enzyme termed CYP2C9. Zafirlukast inhibits the action of CYP3A4, resulting in drug-dru