Impact of Pharmacist-Led Counseling on Antihypertensive Adherence in Community Pharmacies

Thesis Abstract

Cardiovascular diseases remain a leading cause of morbidity and mortality globally, with antihypertensive non-adherence driving poor blood pressure control and increased healthcare costs; the effectiveness of pharmacist-led counseling in improving adherence within community pharmacies remains variably documented across settings. This study aims to evaluate the impact of structured pharmacist-led counseling on antihypertensive adherence among adults receiving care in community pharmacies, with specific objectives to (i) quantify changes in adherence using validated measures, (ii) examine blood pressure outcomes over a six-month period, (iii) identify patient-reported barriers and facilitators to adherence, and (iv) explore the influence of counseling intensity and duration on adherence trajectories. A mixed-methods design is employed, integrating a quasi-experimental, controlled before-and-after component with a concurrent qualitative strand. The quantitative component will recruit 400 adults aged 30–75 years on at least one antihypertensive medication from 20 community pharmacies, randomized at the pharmacy level into intervention (n?200) and usual-care control groups (n?200). The intervention comprises standardized, pharmacist-led counseling sessions delivered at dispensing and reinforced through monthly follow-up calls, aligned with the Health Belief Model and Self-Efficacy Theory to enhance perceived susceptibility, benefits, barriers, and self-management confidence. Data collection utilizes (i) Medication Adherence Report Scale (MARS-5) and Pharmacy Refill Records to derive Medication Possession Ratio (MPR) at baseline, 3 months, and 6 months; (ii) calibrated automated blood pressure monitoring following guideline-based protocols; and (iii) a structured patient survey capturing demographic variables, comorbidities, health literacy (validated tool), and psychosocial determinants. The qualitative component consists of semi-structured interviews with a purposive sample of 40 participants from the intervention arm post-intervention, analyzed thematically to contextualize adherence behaviors and perceived value of counseling. Data analysis will employ intention-to-treat principles. Quantitative analyses include descriptive statistics, mixed-effects linear regression to model changes in MPR and systolic/diastolic blood pressure over time, and analysis of covariance to adjust for baseline covariates. Mediation analysis will assess whether changes in self-efficacy and health literacy mediate adherence outcomes. The qualitative data will be analyzed using Braun and Clarke’s thematic analysis to generate coding schemes that inform interpretation of quantitative results. Plausible expected findings include a statistically significant increase in MPR (mean difference 0.08–0.12; p<0.05) and improved systolic BP reduction (?5 to ?8 mmHg) in the intervention group versus control, with greater adherence gains among participants reporting higher counseling intensity and health literacy. The study anticipates identifying key barriers such as complex regimens and adverse effects, and facilitators including personalized counseling, reminder strategies, and pharmacist-patient trust. The research will contribute to knowledge by providing robust, real-world evidence on the effectiveness of pharmacist-led counseling in improving antihypertensive adherence and BP outcomes, elucidating the mechanisms via perceived benefits and self-efficacy, and offering a scalable model for integration into primary care workflows. The implications include informing national guidelines on pharmacist interventions for chronic disease management, guiding policy on reimbursement for pharmaceutical care services, and shaping training curricula to enhance communication skills and behavioral change techniques among community pharmacists. The study concludes that structured pharmacist-led counseling, delivered consistently within community pharmacies and supported by follow-up, can meaningfully improve adherence and clinical outcomes, with recommendations advocating for integrated care pathways, routine adherence monitoring, and ongoing evaluation of counseling programs to sustain benefits beyond the intervention period.