Interactions
Drug-Drug
Use with mercaptopurine and azathioprine
bone marrow depressant propertiesdoses of these drugs should be 
Use with ampicillin or amoxicillin
risk of rash
Use with oral hypoglycemic agents and warfarin
effects of these drugs
Use with thiazide diuretics or ACE inhibitors
risk of hypersensitivity reactions
Large doses of allopurinol may
risk of theophylline toxicity
May
cyclosporine levels
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