Cadazolid is a new antibiotic in development for the treatment of Clostridium difficile-associated diarrhea. Cadazolid is active against all (including linezolid- and moxifloxacin-resistant) Clostridium difficile strains (MIC90 0.125, range 0.03-0.25 mg/L). The cadazolid geometric mean MIC is 152-fold, 16-fold, 9-fold and 7-fold lower than those of moxifloxacin, linezolid, metronidazole and vancomycin, respectively. Both cadazolid dosing regimens rapidly reduce Clostridium difficile viable counts and cytotoxin with no evidence of recurrence.
|Cell lines||C. difficile|
|Preparation method||Experiments to assess the effects of cadazolid and comparator antibiotics on C. difficile toxin formation were done by determination of toxin A and B concentrations in stationary-phase cultures of toxigenic C. difficile|
|Concentrations||0.3% (vol/vol) DMSO|
|Incubation time||24 h|
|Animal models||Hamster model of CDAD|
|Formulation||0.5% [wt/wt] methylcellulose containing 0.05% [wt/vol] Tween 80|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
|Solubility||DMSO ≥ 90 mg/mL|
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