Tacrolimus blood levels compared to its daily dose. (A) Blood levels of tacrolimus when patient administered brand or generic version. Day 0 was when patient received matched unrelated allogeneic stem cell transplant. X represents the patient’s blood tacrolimus levels (ng/ml). Red lines represent the upper and lower limits of tacrolimus therapeutic trough level. (GVHD): graft-versus-host disease. (B) Tacrolimus dose per day (mg/kg) and voriconazole dose per day (mg/kg) for the same time interval.