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  • Title: Pharmacokinetics of Intravenous Isavuconazole in Solid-Organ Transplant Recipients.
    Author: Wu X, Clancy CJ, Rivosecchi RM, Zhao W, Shields RK, Marini RV, Venkataramanan R, Nguyen MH.
    Journal: Antimicrob Agents Chemother; 2018 Dec; 62(12):. PubMed ID: 30275091.
    Abstract:
    Isavuconazole may be useful in treating and preventing fungal infections in solid-organ transplant (SOT) recipients due to its safety profile and activity against Aspergillus and some Mucorales Isavuconazole has favorable pharmacokinetics based on clinical trials in various patient populations, but data are limited in SOT recipients. We evaluated the steady-state pharmacokinetics of isavuconazole in 26 SOT recipients receiving the drug intravenously for prophylaxis. There was moderate interpatient variability in isavuconazole pharmacokinetic parameters (coefficients of variation of 51% for the area under the plasma concentration-versus-time curve [AUC] and 59% for the trough plasma concentration [Ctrough]). AUC and steady-state Ctrough were significantly lower in women, patients with a body mass index of ≥18.5 kg/m2, and those receiving hemodialysis. Trough plasma concentrations were highly correlated with AUCs (R2 = 0.94) and can serve as a suitable measure of isavuconazole exposure in patients. In conclusion, moderate interpatient variability in isavuconazole exposure, the identification of factors associated with lower exposure, the recognition that Ctrough is a surrogate marker for AUC, and the availability of a simple analytical method suggest that therapeutic drug monitoring (TDM) may be useful for guiding treatment in at least some SOT recipients. Future studies are needed to correlate isavuconazole exposure with patients' clinical outcomes and to determine the clinical role of TDM.
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