Development and Evaluation of a Pharmacist-Led Medication Adherence Program

Thesis Abstract

Non-adherence to prescribed medication regimens poses a significant challenge to optimal health outcomes and healthcare systems worldwide, particularly among patients managing chronic illnesses such as hypertension, diabetes, and cardiovascular diseases. Despite widespread recognition of medication adherence as a critical determinant of treatment success, numerous barriers—including complexity of medication regimens, lack of patient understanding, and limited pharmacist-patient interaction—contribute to suboptimal adherence rates. This study aims to develop, implement, and rigorously evaluate a pharmacist-led medication adherence program designed to improve adherence behaviors among adult patients with chronic conditions in a tertiary healthcare setting. The specific objectives are to (1) assess baseline medication adherence levels among the target population, (2) design an evidence-based intervention incorporating counseling, educational materials, and follow-up support rooted in the Health Belief Model and Social Cognitive Theory, (3) implement the intervention over a six-month period, and (4) evaluate its effectiveness using quantitative and qualitative approaches. A quasi-experimental research design with a pre-test and post-test control group was employed to allow for robust assessment of the intervention’s impact. The study population comprised 400 adult patients diagnosed with hypertension or diabetes attending outpatient clinics at a specialized hospital. Participants were randomly assigned to intervention (n=200) and control groups (n=200), with sample size determination based on power analysis to detect a minimum effect size of 0.3 at 80% power (?=0.05). Data collection instruments included validated medication adherence scales (e.g., Morisky Medication Adherence Scale-8), structured questionnaires assessing knowledge and beliefs, and semi-structured interview guides for qualitative insights. Instrument validity was established through expert review and pilot testing; reliability was confirmed via Cronbach's alpha coefficients exceeding 0.8. Quantitative data were analyzed using descriptive statistics, paired t-tests, chi-square tests, and multiple regression analysis to identify predictors of adherence and measure changes attributable to the intervention. Thematic analysis, following Braun and Clarke’s framework, was employed to analyze qualitative interview data, providing contextual understanding of patient perspectives. The intervention's effectiveness is anticipated to manifest as a statistically significant increase in medication adherence scores, improved patient knowledge, and positive shifts in health beliefs among the intervention group compared to controls. Expected findings include a 20% increase in adherence rates in the intervention group, alongside enhanced medication understanding and reduced perceived barriers. The study contributes novel evidence on the feasibility and efficacy of a structured pharmacist-led adherence program within a resource-constrained setting, emphasizing the importance of integrating behavioral theories into intervention design. It expands existing literature by providing a comprehensive model for pharmacists to actively promote medication adherence, grounded in behavioral change theories and tailored to patient needs. The main conclusion underscores that pharmacist-led interventions can substantially improve medication adherence, thereby potentially reducing medication-related complications and healthcare costs. Recommendations include institutionalizing pharmacist-led adherence counseling within routine clinical practice, expanding staff training on behavioral change techniques, and leveraging digital tools for sustained follow-up. This research also highlights avenues for further investigation into long-term adherence sustainability and adaptation of similar models across diverse healthcare environments to maximize patient-centered outcomes and systemic efficiencies.