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A soybean-derived sterylglucoside mixture (SG) is a potential enhancer of the nasal absorption of insulin. The aim of the study was to examine the absorption of insulin given as the powder dosage form with SG and excipient and to determine the subchronic effects of SG on the morphology of rabbit nasal epithelium. The insulin powder dosage form with SG was administered to the rabbit nasal cavity for five successive days. The average bioavailability and the average pharmacological bioavailability of insulin were about 25.0 and 61.6%, respectively. The nasal mucosa was taken from the nasal cavity and side-effects were investigated using an optiphoto light microscope. The insulin powder dosage form with SG produced no signs of inflammation, erosion or squamous metaplasia. These findings indicate that SG can be considered as a safe and effective enhancer and excipient in the nasal insulin powder dosage form.

biological and pharmaceutical bulletin

High Absorbency and Subchronic Morphologic Effects on the Nasal Epithelium of a Nasal Insulin Powder Dosage Form with a Soybean-derived Sterylglucoside Mixture in Rabbits.