Objective: To examine the dose-response relationship of acarbose, an alpha-glucosidase inhibitor, in older subjects with type 2 diabetes.
Research design: Fourteen subjects with type 2 diabetes who were over 65 years old were studied. Five subjects had been treated with diet alone and 9 were receiving a sulfonylurea. The subjects underwent a meal tolerance test in the presence of varying doses of acarbose (0, 25, 50, and 100 mg) on 4 occasions, each 1 week apart. The test meal was chosen to include food items commonly consumed during breakfast in the United States. The 483-kcal meal consisted of 51% of calories in the form of carbohydrates, 14% protein, and 35% fat. The serum glucose, insulin, and triglyceride levels were measured at 0, 1, and 2 hours after the meal.
Results: The postprandial hyperglycemic response to the test meal was significantly reduced with 25 mg of acarbose compared with baseline values. Increasing doses of acarbose to 50 or 100 mg had no significant additional ameliorating effects on postprandial hyperglycemia. Postprandial insulin or triglyceride levels were not significantly altered with single dose acarbose treatment.
Conclusions: It is concluded that the acute efficacy of acarbose is near maximal at 25 mg when the meal size does not exceed 483 kcal and contains only 61 gm of carbohydrates.