Two Cases of Ulcerative Colitis with Adjusted Tacrolimus by Daily Therapeutic Drug Monitoring

Abstract

　It is suggested that in the use of tacrolimus for treatment of ulcerative colitis, it is important to achieve and maintain a high trough level as soon as possible. We examined two cases, with a starting initial dose higher than that recommended in the package insert, and adjusted the dose by daily therapeutic drug monitoring. Improvement of symptoms was observed by maintaining a high trough level of 10 to 15 ng/mL in these 2 cases. This improvement was observed from 9 days after achieving the high trough level, and it took the same number of days as stated in the mode of administration in the package insert.