6-mercaptopurine

6-Mercaptopurine is a medication used primarily to treat certain types of blood cancers, like leukemia, and to help prevent organ rejection after transplants. It works by interfering with the growth of cancerous or overactive immune cells, effectively slowing or stopping their multiplication. As a chemotherapy agent, it targets rapidly dividing cells, which include cancer cells and some immune cells, helping to control disease progression. It is usually prescribed under close medical supervision because of potential side effects and the need for monitoring blood counts to ensure safe and effective treatment.