What conditions is Azathioprine mainly used to treat?

Azathioprine is primarily utilized as an immunosuppressive agent, making it particularly effective in the treatment of autoimmune conditions. One of the key indications for Azathioprine is rheumatoid arthritis, where it helps to decrease the immune response that contributes to inflammation and joint damage. Its ability to inhibit the proliferation of immune cells is critical in managing this chronic condition, allowing for better long-term treatment outcomes.

In contrast, systemic lupus erythematosus is primarily treated with other agents such as corticosteroids and antimalarials. Conditions like hypertension and diabetes mellitus do not involve the immune system in the same way and are treated with entirely different classes of medications. Therefore, Azathioprine's role as a disease-modifying antirheumatic drug (DMARD) is central to its use in rheumatoid arthritis, confirming its appropriateness for this particular condition.