Severe myelosuppression causing pancytopenia in a patient with Crohn’s disease: an uncommon complication of azathioprine

Azathioprine, is widely used to treat many diseases as a steroid sparing drug, including inflammatory bowel disease. Whilst it can commonly result in leucopenia, in rare instances, it can cause severe myelosuppression and pancytopenia. We present a patient with Crohn’s disease, who developed severe myelosuppression resulting in pancytopenia and neutropenic sepsis secondary to azathioprine use.