Displaying 3 results of Azathioprine Stable Isotopes Azathioprine is a medication used to prevent organ rejection in transplant patients and treat autoimmune diseases such as rheumatoid arthritis and Crohn's disease. Stable isotopes of Azathioprine are used in research and pharmaceutical development to better understand the drug's mechanism of action and improve its efficacy and safety. The stable isotopes are non-radioactive and can be safely used in clinical trials and other studies.