Answer
Concomitant use of febuxostat magnesium with azathioprine or mercaptopurine is not recommended because febuxostat inhibits xanthine oxidase, potentially increasing their plasma concentrations and causing severe toxicity.
Sources for this answer
- ELSTABYA 120 mg film-coated tabletsAmarox Limited · emc · SmPC §4.4 Special warnings and precautions for use · Version 3Document updated
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