Tell your doctor about all your other medicines, especially:
erythromycin;
fluconazole;
theophylline; or
warfarin, Coumadin, Jantoven.
This list is not complete. Other drugs may affect zafirlukast, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
 Zafirlukast drug interactions (more detail)
Does Zafirlukast interact with my other drugs?
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