Abstract
Background: There is a growing number of older adults in India and accordingly a rising burden of non-communicable diseases (NCDs). Poor medication adherence among patients with NCDs is prevalent in India and is associated with adverse outcomes, increased mortality and consequently increased patient and healthcare system costs. Understanding the factors which influence adherence across India is vital to guide interventions towards improved adherence. This study examined the factors influencing medication adherence in older adults (50 years or older) with NCDs in India. Methods:. Data analysis was conducted from the second wave of the World Health Organisation’s ‘Study on global AGEing and adult health (SAGE)’ to identify socioeconomic, health-related, geographical and social support variables that influence medication adherence in adults with NCDs. Bivariate analysis and multivariate logistic regression modelling were conducted. Results: The average medication adherence rate was 51% across 2840 patients with one or more NCDs. The strongest factors predicting non-adherence were multimorbidity (odds ratio 0.49, 95% CI 0.41-0.58) and feelings of depression (0.48, 95% CI 0.32-0.70). Rural living (0.71, 95% CI 0.48-1.05), tobacco use (0.75, CI 0.58-0.97), never having attended school (0.75, 95% CI 0.62-0.92) and feelings of anxiety (0.83, 95% CI 0.67-1.02) were also independent associated with poor adherence. Older age (1.89, 95% CI 1.40-2.55) was associated with improved adherence while there was a weak association between increased wealth and medication use. Conclusion: Our analysis provides evidence that poor medication adherence in India is multifactorial, with distinct socioeconomic and health-system factors interacting to influence patient decision making. Public health interventions to improve medication adherence should focus on barriers that may exist due to multimorbidity, comorbid depression and low educational status.