Patients with severe refractory ulcerative colitis (UC) or those who received placebo in study F506-CL-1107 study can participate in this study. Patients will receive tacrolimus for a maximum of 12 weeks in an open-label study manner. Improvement of Disease Activity Index (DAI) score and other efficacy scores will be evaluated during the drug administration period.
Patients with severe refractory ulcerative colitis (UC) or those who received placebo in study F506-CL-1107 will receive tacrolimus for a maximum of 12 weeks. Safety and efficacy will be evaluated.