Abstract
The effects of osmotic pressure and viscosity have been examined on the intestinal absorption of quinine from solutions containing various amounts of sucrose or sodium carboxymethyl cellulose in the rat. The amount of quinine absorbed from 0 to 240 minutes was highest from the hypotonic and isotonic solutions and decreased with increasing osmotic pressure or viscosity. However, the effect was more marked with osmotic pressure than viscosity. Similar results were obtained on bioavailability. These results were consistent with the observations reported previously that gastric emptying rate and quinine concentration of the gastric effluent were more markedly reduced by increasing osmotic pressure than by increasing viscosity.
