Tacrolimus dosage requirements in lung transplant recipients receiving antifungal prophylaxis with voriconazole followed by itraconazole: a preliminary prospective …

CY Enderby, MG Heckman, CS Thomas… - Clinical …, 2014 - Wiley Online Library
CY Enderby, MG Heckman, CS Thomas, CA Keller
Clinical Transplantation, 2014Wiley Online Library
Background Concomitant administration of the triazole antifungals, voriconazole or
itraconazole, with tacrolimus can result in significant drug interaction in the transplant
recipient. Limited published information exists regarding tacrolimus dosing when
transitioning from voriconazole to itraconazole. The objective of this study was to evaluate
the extent of the drug interaction with antifungal prophylaxis using voriconazole followed by
a change to itraconazole in lung transplant recipients receiving tacrolimus. Methods This …
Background
Concomitant administration of the triazole antifungals, voriconazole or itraconazole, with tacrolimus can result in significant drug interaction in the transplant recipient. Limited published information exists regarding tacrolimus dosing when transitioning from voriconazole to itraconazole. The objective of this study was to evaluate the extent of the drug interaction with antifungal prophylaxis using voriconazole followed by a change to itraconazole in lung transplant recipients receiving tacrolimus.
Methods
This prospective study included lung transplant recipients receiving antifungal prophylaxis with voriconazole followed by a switch to itraconazole. Patients were followed from the time of transplant until two months after converting to itraconazole. All patients received standard immunosuppression with tacrolimus, mycophenolate mofetil, and a corticosteroid. Tacrolimus dose normalized concentrations using concentration/dose ratio were compared while receiving voriconazole versus itraconazole.
Results
Twenty lung transplant recipients were included in the final analysis. No difference was found with the tacrolimus dose normalized concentrations on voriconazole 254 ± 28 (ng/mL)/(mg/kg) compared with itraconazole 234 ± 34 (ng/mL)/(mg/kg), p = 0.65.
Conclusion
Tacrolimus dosage adjustments were not necessary when converting from voriconazole to itraconazole. Validation in a larger population is needed to confirm these findings.
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