In two randomized, placebo-controlled, double-blind studies, the efficacy, duration of action and tolerability of a single morning dose of 25, 50, and 100 mg miglitol (BAY m 1099), an absorbable inhibitor of intestinal α-glucosidases, were assessed after repetitive sucrose or maize-starch loads (50 g of carbohydrates in 400 ml of water each at 08.00, 12.00, and 17.00 h). With sucrose, miglitol reduced the postprandial rise in blood glucose, serum insulin and serum gastric inhibitory polypeptide concentrations at any dosage. This effect was dose-dependent and confined to the first carbohydrate load in the morning, thus indicating the duration of α-glucosidase inhibition of less than 4 h. Sucrose malabsorption, indicated by breath hydrogen responses, occurred dose-dependently with 50 and 100 mg, but not with 25 mg of miglitol. Similarly, symptoms of carbohydrate malabsorption were absent with 25 mg of the inhibitor and mild to moderate after 50 and 100 mg of miglitol. With starch as the substrate, BAY m 1099 led to a significant amelioration of glycemic and hormonal rises after the first meal, but not thereafter. A numerical dose dependency was recognized, but this was not significant at the 5 % level. Symptoms of carbohydrate malabsorption were absent with 25 mg and negligible with 50 mg BAY m 1099, but occurred almost regularly with the 100-mg dose. Breath hydrogen concentrations increased gradually with the dose of miglitol administered. A single morning dose of 25–100 mg of miglitol thus may be useful for the control of postprandial hyperglycemia after breakfast. Due to the duration of action of less than 4 h, this substance should be given with the three main meals.

Keywords:
α-Glucosidase inhibition, Deoxynojirimycin derivatives, Miglitol, Digestion, Diabetes mellitus, Carbohydrate malabsorption
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© 1991 S. Karger AG, Basel
1991
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