Background: Diabetes mellitus could be a prevalent illness, particularly among the elderly. Within the final 15 a long time alone, the predominance of analyzed diabetes cases has expanded by 82%. Age-related changes including diminished insulin affectability within the peripheral tissues and decreased insulin control of hepatic glucose yield, coupled with physical inactivity and overweight, contribute to higher frequencies of abnormal glucose resistance inside the older population. Objective(s): The aim of this study is to evaluate the effectiveness of an educational program on diabetic patient's knowledge about early complications of Diabetes Mellitus: Type I and Type II. Methodology: This paper is the published part of a larger study in which a quasi- experimental design used with the application of a pre-test/ posttest approach for the study group and control group after implementation of educational program.