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To confirm the increased bioavailability of indomethacin (IND) when incorporated in a preparation with egg albumin and olive oil, we studied the detailed pharmaceutical characteristics of a ternary formulation consisting of egg albumin, IND and olive oil. From the results of X-ray powder diffraction measurements, the drug in the formulation was found to be in an amorphous form. When orally administered to rats, the ternary formulation significantly increased the plasma concentration and cumulative biliary and urinary excretion of IND alone as well as the urinary excretion of its major metabolite, desmethylindomethacin, compared with the drug alone. In addition, the dissolution rate of IND from the formulation was higher than that of the drug alone. These results clearly suggest that the bioavailability of IND was markedly improved by incorporating it in a protein-drug formulation containing olive oil as an absorbefacient element, and this effect may be due to an increased absorption of IND.

Pharmacological and Pharmaceutical Properties of Freeze-Dried Formulations of Egg Albumin, Indomethacin, Olive Oil, or Fatty Acids. II.