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Patient nonadherence to physicians’ prescribed medication is the greatest challenge in the effective treatment of diabetic patients. Nonadherence to medication could result in various diabetic complications. The theory of planned behavior was used to guide the study. Data regarding diabetic complications were collected from 119 records during a cross-sectional review of patient dockets. Level of adherence was determined from an eight-item interviewer-administered adherence scale and HbA1c levels. A multiple regression analysis revealed that lower levels of patient adherence to treatment and higher HbA1c levels predicted greater severity of cardiovascular disease, nephropathy, and neuropathic foot ulcer.