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  • Title: Pharmacokinetic variability of sirolimus in Taiwanese renal transplant recipients.
    Author: Chueh SC, Wang SM, Lai MK, Chen J.
    Journal: Transplant Proc; 2004 Sep; 36(7):2058-9. PubMed ID: 15518745.
    Abstract:
    To evaluate the pharmacokinetic variability of sirolimus (Rapamycin, SRL) in our renal transplant (RTx) recipients, dose-normalized trough concentration (C(0)) of SRL, and their intrasubject coefficients of variation (%CV) were analyzed. Thirty-eight patients were enrolled in regimens containing SRL. Concomitant immunosuppression included steroids (n = 38), cyclosporine (n = 33), tacrolimus (n = 3), and mycophenolate mofetil (n = 7). The mean dose-normalized C(0) was 2.13 +/- 0.91 ng/mL/mg. The intrasubject %CV of the dose-normalized C(0) ranged from 14% to 88% and averaged 42% in our series. The mean dose-normalized C(0) of SRL in our RTx recipients was much lower than that reported in Phase III trials. The intrasubject variation of dose-normalized C(0), even after administrating SRL for 6 months, could still be quite prominent. Thus, we suggest that, to maintain adequate therapeutic concentrations, periodic (monthly or bimonthly) SRL C(0) measurement is necessary in Taiwanese (Oriental) patients receiving SRL.
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