PRECAUTIONS: Before taking thioguanine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.Before taking this medicine, consult your doctor or pharmacist if a certain drug (mercaptopurine) did not work for you in the past. This may affect how well thioguanine works for you.Before using this medication, tell your doctor or pharmacist your medical history, especially of: other blood disorders (e.g., anemia, low blood cell counts), gout, kidney stones, liver disease.Do not have immunizations/vaccinations without the consent of your doctor, and avoid contact with people who have recently received oral polio vaccine or flu vaccine inhaled through the nose.Wash your hands well to prevent the spread of infections.To lower your risk of getting cut, bruised, or injured, use caution with sharp objects like razors and nail cutters, and avoid activities such as contact sports.If you need to have surgery or a dental procedure, tell your doctor or dentist that you are using thioguanine.Drinking alcohol may increase the risk of stomach/esophagus irritation or liver damage. Limit alcoholic beverages.People with a certain inherited problem (lack of thiopurine methyltransferase-TPMT enzyme) may be at increased risk for serious side effects from this medication and may require dosage adjustment. Consult your doctor for details and to discuss whether you should be tested for this inherited problem.This medication is not recommended for use during pregnancy. It may harm an unborn baby. Consult your doctor for more details and to discuss reliable forms of birth control. If you become pregnant or think you may be pregnant, tell your doctor immediately.It is not known whether this drug passes into breast milk. Because of the possible risk to the infant, breast-feeding while using this drug is not recommended. Consult your doctor before breast-feeding.
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