Medication Adherence Changes in Blacks with Diabetes: A Mixed Methods Study.

In this study, we conducted a longitudinal evaluation of changes in medication adherence and the role of psychosocial and interpersonal factors in these changes among Blacks with type 2 diabetes mellitus (T2DM), and determined barriers and facilitators of T2DM medication adherence. We used an explanatory sequential mixed methods design for a sample of 287 black adult patients with T2DM in Wisconsin. Two surveys quantitatively evaluated changes in medication adherence, psychosocial factors, and interpersonal factors over time. We conducted 10 semi-structured qualitative interviews to explore participants' perceptions of these changes. Data integration of the quantitative and qualitative findings elucidated barriers and facilitators of medication adherence. Increased adherence was significantly correlated with less concerns about medicines (r = -0.31), higher self-efficacy (r = 0.47), lesser depressive symptoms (r = -0.26), and lesser negative illness perceptions (r = -0.26) at both baseline and follow-up. Patient perceptions of adherence changes included adherence motivators, social support, and complex medication regimens. Integration showed that barriers and facilitators both existed in individuals who had an increase or a decrease in adherence over time. Specific beliefs of Blacks towards T2DM medications must be addressed to improve their adherence. Interventions must be tailored using interpersonal factors.