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Objectives: to identify the beliefs of people with Type 2 Diabetes Mellitus related to insulin use. Methods: a descriptive, cross-sectional, quantitative-qualitative study based on Theory of Planned Behavior and performed with 32 participants using insulin. The data were analyzed and grouped into categories by beliefs similarity, counted from the frequencies. Results: 118 behavioral, 60 normative and 97 control beliefs were issued. Among the behavioral beliefs, there was an advantage in keeping the diabetes under control and disadvantage, the pain of being pierced by the application of insulin. Regulations highlighted the children as referents who support the treatment. In control beliefs, it was observed that the application of insulin appears as easiness and difficulty to the treatment. Conclusions: the study will support the construction of a psychometric scale to measure the determinants of insulin use, revealing particularities for the structuring of educational interventions that contribute to adherence of the treatment verified in adequate glycemic control.

Objective: To identify beliefs related to oral antidiabetic use among individuals with type 2 diabetes mellitus, based on the Theory of Planned Behavior. Method: This is a descriptive, quantitative and qualitative study conducted with 32 participants using oral antidiabetic drugs. Data was collected through an open question tool and analyzed by number of emissions and content. Results: Among the behavioral beliefs, the following stand out: (a) as an advantage, to keep diabetes controlled; and (b) as disadvantages, gastric pain and discomfort, nausea and diarrhea. In the normative beliefs, family stood out as a social referent (children, mother and siblings). As for the control beliefs, taking the tablets with water and the size of the tablets stood out as practicalities and difficulties, respectively, in relation to the oral therapy follow-up. Conclusion and implications for practice: It was possible to identify the beliefs regarding the behavior of taking oral antidiabetics that will contribute to foster educational strategies with the potential to strengthen the positive beliefs and to revert the negative ones, in favor of adherence to drug therapy, glycemic control and quality of life.

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