Abstract
In a previous study, we noted wide inter-individual variability in drug interactions between voriconazole and tacrolimus, but that analysis did not take into account the routes of administration. In the present study, we analyzed interactions between these two drugs when both agents were administered orally after allogeneic hematopoietic stem cell transplantation (HSCT); the effect of plasma voriconazole levels on the magnitude of the drug interaction was also examined. Twenty-five allogeneic HSCT recipients were evaluated. Trough concentrations of tacrolimus were measured prior to, and periodically for 7–10 days after, initiating voriconazole (400 mg/day) to determine the concentration/dose (C/D) ratio of tacrolimus. The median C/D ratio of tacrolimus increased significantly from 172.8 (range 28.6–1110.7) to 537.5 (range 127.8–1933.3) (ng/mL)/(mg/kg) (P < 0.01) following initiation of voriconazole; the median increase was 138.8 % (range −32.0 to 685.7 %). The plasma concentration of voriconazole did not correlate with the increase of the tacrolimus C/D ratio (ρ = 0.16, P = 0.44). These results indicate that oral voriconazole has a significant drug interaction with oral tacrolimus with a wide inter-individual variability, which cannot be explained by the bioavailability of voriconazole. Other possible mechanisms should be explored in future studies.
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Acknowledgments
This work was supported in part by grants from the Japanese Ministry of Health, Labor, and Welfare.
Conflict of interest
All authors report the following funding sources which could have possible relevance to the work described here: Division of Hematology, Department of Medicine, Keio University School of Medicine has research funding from Pfizer Inc. and Astellas Pharma Inc.
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Mori, T., Kato, J., Yamane, A. et al. Drug interaction between voriconazole and tacrolimus and its association with the bioavailability of oral voriconazole in recipients of allogeneic hematopoietic stem cell transplantation. Int J Hematol 95, 564–569 (2012). https://doi.org/10.1007/s12185-012-1057-2
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DOI: https://doi.org/10.1007/s12185-012-1057-2