Abstract
The bile salt derivative sodium tauro-24,25-dihydrofusidate (STDHF) has been reported to promote nasal absorption of insulin. In the present study the effect of STDHF on rectal insulin absorption was investigated in rats. At concentrations of 1 and 4% (w/v) it enhanced insulin bioavailability from 0.2 +/- 0.2 (control) to 4.2 +/- 3.2 and 6.7 +/- 2.1%, respectively, as assessed by radioimmunoassay. Insulin preparations with STDHF reduced blood glucose concentrations considerably in a concentration-dependent way. Coadministration of STDHF with Na2EDTA (0.25%, w/v) tended to increase further insulin bioavailability and hypoglycemic response. Varying the site of rectal administration did not influence these parameters.
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