Side effects of azathioprine in patients with Crohn's disease.

Objective: In clinical trials 0-15% of patients discontinued azathioprine due to side effects. The aim of this study was to assess the rate of side effects leading to discontinuation of azathioprine and to determine predictive factors for discontinuation.

Design: A retrospective cohort analysis of clinical data regarding adverse events of azathioprine in Crohn's disease.