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Why has my veterinarian prescribed Azathioprine for my dog?
Azathioprine is used to suppress the immune system.  It is used to treat diseases and disorders caused by an overactive immune system. Examples of conditions the medication may be used for include: immune mediated skin disease, autoimmune hemolytic anemia, thrombocytopenia, rheumatoid arthritis, polyarthritis, polymyositis, eosinophilic enteritis, myasthenia gravis, atrophic gastritis, ulcerative colitis, systemic lupus erythematosus, ocular histiocytoma, and chronic active hepatitis. When taking this medication, your pet may become more susceptible to infections. If you can, keep your dog away from other animals with infections.