Preferred embodiments of the present invention are related to novel therapeutic drug combinations and methods for treating and/or preventing complications in patients with diabetes and/or metabolic syndrome. More particularly, aspects of the present invention are related to using a combination of cicletanine and an oral antidiabetic agent for treating and/or preventing complications (including microalbuminuria, nephropathies, retinopathies and other complications) in patients with diabetes or metabolic syndrome.