Azathioprine is an immunosuppressive medication often used to treat conditions where the immune system is overactive. It's commonly prescribed for autoimmune diseases such as rheumatoid arthritis, lupus, and inflammatory bowel diseases like Crohn's disease and ulcerative colitis. It's also used to prevent the body from rejecting a transplanted organ.

Azathioprine works by interfering with the synthesis of DNA in immune cells, thereby reducing the activity of the immune system. Because it suppresses your immune system, there is an increased risk of infections and other side effects, so regular monitoring by a healthcare provider is essential.

Patients taking azathioprine often need routine blood tests to monitor their blood cell counts and liver function. It's important to follow your healthcare provider's instructions and report any unusual symptoms, such as signs of infection or unusual bleeding, as soon as possible.

As with any medication, it's crucial to discuss the potential benefits and risks with your healthcare provider to determine if azathioprine is the right choice for your specific condition.