Abstract
Levonadifloxacin is a novel benzoquinolizine subclass of fluoroquinolone, active against quinolone-resistant Staphylococcus aureus A phase 3 trial for levonadifloxacin and its oral prodrug was recently completed. The present study identified area under the concentration-time curve for the free, unbound fraction of a drug divided by the MIC (fAUC/MIC) as an efficacy determinant for levonadifloxacin in a neutropenic murine lung infection model. Mean plasma fAUC/MIC requirement for static and 1 log10 kill effects against 9 S. aureus were 8.1 ± 6.0 and 25.8 ± 12.3, respectively. These targets were employed in the selection of phase 3 doses.
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