Insulin-metformin combination therapy in obese patients with type 2 diabetes.

The aim of the study was to evaluate the effects of insulin-metformin combination therapy compared to insulin monotherapyin obese, insulin-requiring patients with type 2 diabetes mellitus. Eighteen patients uncontrolled on > or = 70 U/day of insulin monotherapy were investigated in this prospective, open-label study. Patients continued their previous insulin and dietary regimens for 4 weeks, after which metformin was added with doses titrated to achieve a fasting plasma glucose (FPG) < 7.