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Difloxacin-d3 is intended for use as an internal standard for the quantification of difloxacin by GC- or LC-MS. Difloxacin is a fluoroquinolone antibiotic.1 It is active against isolates of anaerobic bacteria, including B. fragilis, as well as Fusobacterium and Actinomyces species with MIC values ranging from ≤0.125 to 8 μg/ml. It eliminates E. coli and B. fragilis infection in a rat intra-abdominal abscess model when administered at a dose of 40 mg/kg three times per day.2

1.Bansal, M.B., and Thadepalli, H.Activity of difloxacin (A-56619) and A-56620 against clinical anaerobic bacteria in vitroAntimicrob. Agents Chemother.31(4)619-621(1987) 2.Thadepalli, H., Gollapudi, S.V., and Chuah, S.K.Therapeutic evaluation of difloxacin (A-56619) and A-56620 for experimentally induced Bacteroides fragilis-associated intra-abdominal abscessAntimicrob. Agents Chemother.30(4)574-576(1986)

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