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Antimicrob Agents Chemother. 2011 Sep;55(9):4394-7. doi: 10.1128/AAC.00833-10. Epub 2011 Jun 27.

In vitro spectrum of activity of finafloxacin, a novel, pH-activated fluoroquinolone, under standard and acidic conditions.

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  • 1MerLion Pharmaceuticals GmbH, Robert-Rössle Strasse 10, Berlin, Germany.


Finafloxacin is a novel fluoroquinolone that exhibits enhanced antibacterial activity under acidic conditions. The aim of this study was to define the in vitro pH-activity relationship. Finafloxacin exhibited optimal antibacterial activity between pH 5.0 and 6.0 at which MICs were 4- to 8-fold lower than those determined at neutral pH. These observations were then confirmed against a larger collection of bacteria. These data suggest that finafloxacin could potentially offer a therapeutic advantage within acidic foci of infection.

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