Medication Compliance in Non-insulin-dependent Diabetes: A Randomized Comparison of Chlorpropamide and Insulin

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Abstract
Medication compliance may be a problem in the management of patients with diabetes. Some physicians initially treat patients having non-insulin-dependent diabetes with oral sulfonylureas because they fear greater compliance problems with insulin therapy. We compared compliance with insulin and chlorpropamide in patients newly beginning medication for NIDDM. Seventy-seven adults with hyperglycemia despite diet therapy were randomly assigned to chlorpropamide or insulin. Compliance was measured four times over 24 wk. Patients then crossed over to the other medication and were followed for 24 additional weeks. Overall, there were no differences in compliance with the two medications in terms of percent of prescription used, proportion taking at least 80% of prescribed medication, self-report of medication or diet compliance, or protocol dropout rates. However, treatment satisfaction was higher with chlorpropamide, and most patients preferred chlorpropamide to insulin (P < 0.0001). While such differences in satisfaction may affect long-term compliance, physicians should not assume that their patients will be less compliant with insulin than with oral sulfonylureas.

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