Abstract
The intestinal trans-epithelial elimination of moxifloxacin was measured in the jejunum, ileum, caecum and in the bile in a rabbit model. Over a 120 min period following a single parenteral administration of moxifloxacin 15 mg/kg, peak serum concentration was 3.1 (+/- 1.1) mg/L. The elimination constants were: 0.019 (+/- 0. 017) microg/cm(2)/min, 0.011 (+/- 0.014) microg/cm(2)/min and 0.002 (+/- 0.002) microg/cm(2)/min in the jejunum, ileum and caecum, respectively. Per loop, over 120 min, the respective eliminated quantities were: 9.59 (+/- 9.37) microg, 8.26 (+/- 6.74) microg and 1.92 (+/- 1.86) microg. Biliary moxifloxacin concentrations varied between 1.30 and 5.16 mg/L and exceeded serum levels from 45 min onwards. Intestinal concentrations paralleled serum moxifloxacin levels. Altogether, approximately 4.5% of the moxifloxacin dose was eliminated trans-epithelially in the digestive tract over the 120 min experimental period.
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