common side effects of azathioprine
These delayed effects may include certain types of cancer, such as leukemia, lymphoma, or skin cancer. The risk of cancer is lower in people taking azathioprine for arthritis, and you should discuss these possible effects with your doctor. After you stop this medicine, there may still be some side effects. During this time notify your doctor as soon as possible if you notice any of the following: black, tarry stools.