Azathioprine is a chemotherapy drug, now rarely used for chemotherapy but more for immunosuppression in organ transplantation, autoimmune disease such as rheumatoid arthritis or inflammatory bowel disease such as Crohn's disease. It is a pro-drug, converted in the body to the active metabolites 6-mercaptopurine and 6-thioinosinic acid.
Azathioprine is produced by a number of generic manufacturers and as branded names (AzasanĀ® by Salix in US and ImuranĀ® by GlaxoSmithKline in UK).

MedlinePlus: Azathioprine - Features information about dosage, usage, warnings, and side effects.
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