Association of Health Literacy with Sociodemographic Factors and Medication Adherence Among Primary Health Care Users in Montenegro

Background/Objectives: Health literacy represents the ability to access, understand, appraise, and apply health information for making appropriate health decisions. It is closely linked to education, income, employment, and overall health outcomes. Limited health literacy is associated with poor self-care, inadequate treatment adherence, and increased healthcare utilization. This study aimed to assess the level of health and medication adherence behaviors among primary health care users in Montenegro and examine its association with key demographic and socioeconomic factors. Methods: A cross-sectional, multicenter study was conducted among 202 primary health care users at the Primary Healthcare Center Danilovgrad, Plav and Ulcinj, Montenegro. Data were collected using a demographic questionnaire, the standardized European Health Literacy Questionnaire (HLS-EU-Q-47), and the Attitudes towards Medication Adherence Self-Reported Questionnaire (ADHERE-7). Statistical analyses included descriptive statistics, χ2 tests, and univariate and multivariate regression. Results: The mean HLS-EU-Q Index was 33.55 ± 8.05. Significant differences in literacy levels were observed by age (p = 0.022), material status (p = 0.043), and self-rated health (p = 0.020). In multivariate ordinal regression analysis, lower income (<400 €) was associated with lower odds of belonging to a higher health literacy category (OR = 0.22, 95% CI: 0.02–0.92, p = 0.039), while no statistically significant associations were observed for gender, education level, or employment status after adjustment. The mean ADHERE-7 score of the study population was 21.78 ± 5.19. When analyzed in relation to the level of health literacy, the highest mean ADHERE-7 score was observed among participants with excellent health literacy (24.28 ± 4.90). Lower levels of health literacy were associated with lower odds of belonging to higher health literacy categories among participants reporting selected non-adherence behaviors, including missing therapy 3–4 times per week (OR = 0.30), frequently skipping prescribed medication when feeling well (OR = 0.03), and reducing or omitting therapy due to perceived lack of benefit or high costs (OR range: 0.10–0.31). Conclusions: Health literacy among primary care users in Montenegro is moderate, with a substantial proportion exhibiting limited literacy. Low income is a key determinant of limited literacy, and limited health literacy was associated with poorer medication adherence. Targeted educational and policy interventions are needed to improve health literacy and reduce health inequalities.