Int J Med Sci 2020; 17(7):859-864. doi:10.7150/ijms.42011

Research Paper

Tacrolimus Concentration after Letermovir Initiation in Hematopoietic Stem Cell Transplantation Recipients Receiving Voriconazole: A Retrospective, Observational Study

Shinichi Hikasa1✉, Shota Shimabukuro1, Yuko Osugi2, Kazuhiro Ikegame2, Katsuji Kaida2, Keiko Fukunaga2, Tomoko Higami1, Masami Tada1, Kuniyoshi Tanaka1, Mina Yanai1, Takeshi Kimura1

1. Department of Pharmacy, Hyogo College of Medicine College Hospital, Nishinomiya, Hyogo 663-8501, Japan
2. Division of Hematology, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan

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Citation:
Hikasa S, Shimabukuro S, Osugi Y, Ikegame K, Kaida K, Fukunaga K, Higami T, Tada M, Tanaka K, Yanai M, Kimura T. Tacrolimus Concentration after Letermovir Initiation in Hematopoietic Stem Cell Transplantation Recipients Receiving Voriconazole: A Retrospective, Observational Study. Int J Med Sci 2020; 17(7):859-864. doi:10.7150/ijms.42011. Available from http://www.medsci.org/v17p0859.htm

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Abstract

Letermovir (LMV) is a new antiviral drug used to prevent cytomegalovirus infection in hematopoietic stem cell transplantation (HSCT) recipients. It has been reported to increase tacrolimus (TAC) exposure and decrease voriconazole (VRCZ) exposure in healthy participants. However, VRCZ inhibits the metabolism of TAC. Thus, the effects of LMV on TAC exposure in patients receiving VRCZ are unknown. This retrospective, observational, single-center study was conducted between May 2018 and April 2019. The TAC concentration/dose (C/D) ratio, VRCZ concentration, and VRCZ C/D ratio for 7 days before and for the first and second 7-day periods after the initiation of LMV administration were evaluated. Fourteen HSCT recipients receiving VRCZ were enrolled. There was no significant difference in the TAC C/D ratio for 7 days before and for the first and second 7-day periods after initiating LMV administration (median: 866 [IQR: 653-953], 842 [IQR: 636-1031], and 906 [IQR: 824-1210] [ng/mL]/[mg/kg], respectively). In contrast, the VRCZ C/D ratio and concentration for the first and second 7-day periods after LMV initiation were significantly lower than those before initiating LMV administration (mean 1.11 ± 0.07, 0.12 ± 0.08, and 0.22 ± 0.12 [μg/mL]/[mg/kg] and 0.7 ± 0.5, 0.8 ± 0.5, and 1.3 ± 0.7 μg/mL, respectively; n = 12). This can be explained by the increase in TAC concentration caused by CYP3A4 inhibition due to LMV and by the decrease in TAC concentration ascribed to the decrease in VRCZ concentration by CYP2C19 induction due to LMV. These results suggest that it is unnecessary to adjust the dose of TAC based on LMV initiation; however, it is necessary to adjust the dose of TAC based on conventional TAC concentration measurements.

Keywords: Letermovir, tacrolimus, voriconazole, interaction, hematopoietic stem cell transplantation