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Medientyp:
E-Artikel
Titel:
Evaluation of Voriconazole Pharmacodynamics Using Time-Kill Methodology
Beteiligte:
Klepser, Michael E.;
Malone, Dennis;
Lewis, Russell E.;
Ernst, Erika J.;
Pfaller, Michael A.
Erschienen:
American Society for Microbiology, 2000
Erschienen in:
Antimicrobial Agents and Chemotherapy, 44 (2000) 7, Seite 1917-1920
Sprache:
Englisch
DOI:
10.1128/aac.44.7.1917-1920.2000
ISSN:
0066-4804;
1098-6596
Entstehung:
Anmerkungen:
Beschreibung:
ABSTRACT Voriconazole is an investigational azole antifungal agent with activity against a variety of fungal species, including fluconazole-susceptible and -resistant Candida species and Cryptococcus neoformans . In this study, we employed in vitro time-kill methods to characterize the relationship between concentrations of voriconazole and its fungistatic activity against Candida albicans , Candida glabrata , Candida tropicalis , and C. neoformans . Isolates were exposed to voriconazole concentrations ranging from 0.0625 to 16 times the MIC, and the viable colony counts were determined over time. The 50 and 90% effective concentrations (EC 50 and EC 90 , respectively) were determined at 8, 12, and 24 h following the addition of voriconazole. At each time point, near-maximal fungistatic activity, as indicated by the EC 90 , was noted at a drug concentration of approximately three times the MIC. Additionally, EC 50 and EC 90 did not change over time, thus suggesting that the rate of activity was not improved by increasing concentrations. Voriconazole exhibits non-concentration-dependent pharmacodynamic characteristics in vitro.