Determinants of medication adherence in patients with diabetes, hypertension, and hyperlipidemia.

Abstract

Objectives: To investigate medication non-adherence and its determinants in diabetes, hypertension, and hyperlipidemia.

Methods: In a multicenter, cross-sectional, non-interventional study, 518 diabetic, 721 hypertensive, and 463 hyperlipidemic patients were recruited, using consecutive sampling, in Greece during the COVID-19 pandemic. Medication adherence was measured with the Adherence to Refills and Medications Scale (ARMS). Multiple linear regressions with robust standard errors investigated the predictors of the ARMS summary score.

Results: Perfect adherence was estimated at 16%, 12%, and 11%, and low adherence at 38.8%, 61.3%, and 66.7% in diabetes, hypertension, and hyperlipidemia, respectively. The factors that significantly increased the likelihood of non-adherence were the following: (a) lower age, female gender, no public health insurance, high perceived threat of illness, low satisfaction with physician consultations, shorter consultations, bad general health, fewer comorbidities, and type 2 diabetes; (b) male gender, not being married, low education, no public insurance, smoking, frequent drinking, shorter consultations, self-perceived inadequacy of knowledge, negative views of medication, presence of comorbidities, fewer medicines being used, and high blood pressure in hypertension; and (c) lower age, not being employed, smoking, frequent drinking, no public insurance, low satisfaction with consultations, negative views of medication, taking 3-4 medicines, high LDL, and low HDL and triglyceride levels in hyperlipidemia. Different curvilinear associations of adherence with BMI and exercise were also found.

Conclusion: Medication non-adherence is very common in diabetes, hypertension, and hyperlipidemia. Strategies to improve adherence should consider the different determinants of non-adherence among patient groups.