Thioguanine is sometimes given together with certain other medicines. If you are using a combination of medicines, make sure that you take each one at the right time and do not mix them. Ask your health care professional to help you plan a way to take your medicine at the right times. While you are using thioguanine, your doctor may want you to drink extra fluids so that you will pass more urine. This will help prevent kidney problems and keep your kidneys working well.
Thioguanine sometimes causes nausea and vomiting.
However, it is very important that you continue to take this medicine, even if you begin to feel ill. Do not stop taking this medicine without first checking with your doctor . Ask your health care professional for ways to lessen these effects. If you vomit shortly after taking a dose of thioguanine, check with your doctor. You will be told whether to take the dose again or to wait until the next scheduled dose.