Zymurine Tablet belongs to a group of medicines called immunosuppressants. It is used with other medicines to prevent your body from rejecting an organ (such as a kidney, heart, or liver) after a transplant. It is also used in the treatment of rheumatoid arthritis. The dose of Zymurine Tablet and how often you need to take it will depend on whether you have had a transplant or are being treated for rheumatoid arthritis. Follow your doctor’s instructions on this. You can take it with or without food. Take the medicine regularly to get the most benefit and keep taking it even if you feel well. If you stop taking it, the risk of organ rejection may increase, and if you're using it for rheumatoid arthritis, your symptoms may not improve.The most common side effects of Zymurine Tablet are nausea and reduction of white blood cells and bone marrow function. Because it suppresses your immune system, you may catch infections easily. There is also an increased risk of developing some cancers for this reason. You should ask your doctor about side effects that may require urgent medical attention.Zymurine Tablet can cause birth defects and miscarriages, so do not take it if you are pregnant, planning to become pregnant, or breastfeeding. You should talk to your doctor before taking this medicine if you have any signs of infection or any unexpected bruising or bleeding. Let your doctor also know what other medications you are taking, as some may interact with this medicine and affect the way it works. You will have regular tests to check for any changes in the number of your blood cells.