DRUG INTERACTIONS: Your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with them first.This drug should not be used within 2 weeks of receiving a live vaccine (e.g., flu, measles, mumps, polio). Before taking this medication, tell your doctor of any planned or recently received vaccines. (See also Precautions section.)This drug should not be used with the following medication because a very serious interaction may occur: azathioprine, febuxostat.If you are currently using the medication listed above, tell your doctor or pharmacist before starting mercaptopurine.Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: aminosalicylates (e.g., olsalazine, mesalazine, sulfasalazine), aspirin, "blood thinners" (e.g., warfarin), drugs that may affect the bone marrow (e.g., trimethoprim/sulfamethoxazole, other cancer chemotherapies), drugs that may affect the liver (e.g., amiodarone, erythromycin).Before using this medication, tell your doctor or pharmacist if you are taking allopurinol. The dose of mercaptopurine may need to be decreased to avoid severe side effects.If your doctor has directed you to take low-dose aspirin for heart attack or stroke prevention (usually at dosages of 81-325 milligrams a day), you should continue taking it unless your doctor instructs you otherwise. Ask your doctor or pharmacist for more details.This product can affect the results of certain lab tests (e.g., uric acid), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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