Potent cytochrome P450 2C19 genotype-related interaction between voriconazole and the cytochrome P450 3A4 inhibitor ritonavir
Objectives Cytochrome P450 (CYP) 2C19 and CYP3A4 are the major enzymes responsible for voriconazole elimination. Because the activity of CYP2C19 is under genetic control, the extent of inhibition with a CYP3A4 inhibitor was expected to be modulated by the CYP2C19 metabolizer status. This study thus...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
19 August 2006
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| In: |
Clinical pharmacology & therapeutics
Year: 2006, Jahrgang: 80, Heft: 2, Pages: 126-135 |
| ISSN: | 1532-6535 |
| DOI: | https://doi.org/10.1016/j.clpt.2006.04.004 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/https://doi.org/10.1016/j.clpt.2006.04.004 Verlag, lizenzpflichtig, Volltext: https://ascpt.onlinelibrary.wiley.com/doi/abs/10.1016/j.clpt.2006.04.004 
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| Verfasserangaben: | Gerd Mikus, Verena Schöwel, Magdalena Drzewinska, Jens Rengelshausen, Reinhard Ding, Klaus-Dieter Riedel, Jürgen Burhenne, Johanna Weiss, Torben Thomsen, and Walter E. Haefeli |
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| 245 | 1 | 0 | |a Potent cytochrome P450 2C19 genotype-related interaction between voriconazole and the cytochrome P450 3A4 inhibitor ritonavir |c Gerd Mikus, Verena Schöwel, Magdalena Drzewinska, Jens Rengelshausen, Reinhard Ding, Klaus-Dieter Riedel, Jürgen Burhenne, Johanna Weiss, Torben Thomsen, and Walter E. Haefeli |
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| 520 | |a Objectives Cytochrome P450 (CYP) 2C19 and CYP3A4 are the major enzymes responsible for voriconazole elimination. Because the activity of CYP2C19 is under genetic control, the extent of inhibition with a CYP3A4 inhibitor was expected to be modulated by the CYP2C19 metabolizer status. This study thus assessed the effect of the potent CYP3A4 inhibitor ritonavir after short-term administration on voriconazole pharmacokinetics in extensive metabolizers (EMs) and poor metabolizers (PMs) of CYP2C19. Methods In a randomized, placebo-controlled crossover study, 20 healthy participants who were stratified according to CYP2C19 genotype received oral ritonavir (300 mg twice daily) or placebo for 2 days. Together with the first ritonavir or placebo dose, a single oral dose of 400 mg voriconazole was administered. Voriconazole was determined in plasma and urine by liquid chromatography-mass spectrometry, and pharmacokinetic parameters were estimated by noncompartmental analysis. Results When given alone, the apparent oral clearance of voriconazole after single oral dosing was 26% ± 16% (P > .05) lower in CYP2C19*1/*2 individuals and 66% ± 14% (P < .01) lower in CYP2C19 PMs. The addition of ritonavir caused a major reduction in voriconazole apparent oral clearance (354 ± 173 mL/min versus 202 ± 139 mL/min, P = .0001). This reduction occurred in all CYP2C19 genotypes (463 ± 168 mL/min versus 305 ± 112 mL/min [P = .023] for *1/*1, 343 ± 127 mL/min versus 190 ± 93 mL/min [P = .008] for *1/*2, and 158 ± 54 mL/min versus 22 ± 11 mL/min for *2/*2) and is probably caused by inhibition of CYP3A4-mediated voriconazole metabolism. Conclusions Coadministration of a potent CYP3A4 inhibitor leads to a higher and prolonged exposure with voriconazole that might increase the risk of the development of adverse drug reactions on a short-term basis, particularly in CYP2C19 PM patients. Clinical Pharmacology & Therapeutics (2006) 80, 126-135; doi: 10.1016/j.clpt.2006.04.004 | ||
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