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Influence of Essential Medicine Availability on Treatment Completion among Patients in Nigerian Primary Healthcare Centres

Abstract

The availability of essential medicines is a fundamental component of effective primary healthcare because patients require continuous access to appropriate medicines to initiate and complete prescribed treatment. Essential medicine availability refers to the extent to which medicines required to manage common health conditions are consistently present, accessible, appropriately stored, and available in adequate quantities at healthcare facilities. Treatment completion refers to the extent to which patients take or receive the full course of prescribed treatment according to the recommended dosage, frequency, and duration. In Nigerian primary healthcare centres, shortages and interruptions in the supply of essential medicines may create barriers to treatment completion, particularly among low-income and rural populations that may have limited capacity to purchase medicines from private pharmacies or travel to alternative healthcare facilities. Medicine stock-outs, irregular supply chains, inadequate procurement systems, poor forecasting, weak inventory management, funding constraints, and distribution challenges may result in patients receiving incomplete treatment or interrupting therapy when medicines are unavailable. Consistent availability of essential medicines may improve treatment continuity by enabling patients to obtain their prescribed medicines at the point of care and reducing the need to seek alternative sources. Against this background, this study investigates the influence of essential medicine availability on treatment completion among patients in Nigerian primary healthcare centres. The study is anchored on the Health Belief Model, Donabedian's Structure-Process-Outcome Model, and the Health Systems Framework. The Health Belief Model explains how perceived benefits, perceived barriers, cues to action, and individual perceptions may influence adherence to recommended treatment. Donabedian's Model identifies the availability of essential medicines and other healthcare resources as structural factors that influence healthcare processes and outcomes. The Health Systems Framework recognizes access to essential medicines and health technologies as a fundamental component of effective health-system performance and service delivery. Collectively, these theoretical perspectives provide a suitable framework for explaining how essential medicine availability may influence treatment completion among patients receiving care at primary healthcare centres in Nigeria. The study will adopt a quantitative cross-sectional research design. Data will be collected from selected Nigerian primary healthcare centres using structured patient questionnaires, medicine availability assessment checklists, pharmacy and dispensing records, stock registers, stock-out records, prescription records, and relevant facility documents. A multistage sampling technique will be employed to select states, local government areas, communities, primary healthcare centres, and eligible patients receiving treatment for selected health conditions. Essential medicine availability will be assessed using indicators such as availability of prescribed medicines, frequency and duration of medicine stock-outs, adequacy of medicine quantities, availability of commonly prescribed essential medicines, stock management practices, procurement regularity, medicine storage conditions, and continuity of medicine supply. Treatment completion will be assessed using indicators such as completion of the prescribed treatment course, adherence to recommended dosage and frequency, adherence to treatment duration, timely refill or follow-up where applicable, absence of premature treatment discontinuation, and patient-reported or documented completion of treatment. Where feasible, patient responses will be compared with prescription, dispensing, refill, or treatment records to improve the objectivity of treatment-completion measurement. Descriptive statistics will be used to summarize medicine availability, patient characteristics, and treatment-completion patterns. Inferential statistical techniques, including chi-square tests, correlation analysis, and multiple regression analysis, will be used to determine the influence of essential medicine availability on treatment completion. Diagnostic tests will also be conducted to assess the reliability of research instruments, model assumptions, goodness of fit, multicollinearity, and robustness of the findings. The study is expected to find that consistent availability of essential medicines has a significant positive influence on treatment completion among patients in Nigerian primary healthcare centres. Patients treated at facilities with reliable supplies of prescribed medicines are expected to be more likely to complete their treatment than patients attending facilities experiencing frequent medicine stock-outs. Continuous medicine availability may reduce the need for patients to purchase medicines elsewhere, travel to distant facilities, substitute prescribed medicines without professional guidance, or discontinue treatment because medicines are unavailable. Adequate medicine availability may therefore improve treatment continuity and strengthen patients' ability to follow prescribed treatment regimens. Conversely, frequent stock-outs may contribute to treatment interruption, incomplete treatment, delayed recovery, inappropriate medicine substitution, and increased use of alternative sources of medicines. However, medicine availability alone may not fully determine treatment completion because completion is also influenced by treatment side effects, treatment duration, cost of care, patient understanding, health literacy, healthcare provider communication, perceived improvement, disease characteristics, and accessibility of follow-up services. Therefore, ensuring medicine availability should be combined with effective patient education, appropriate prescribing, counselling, and follow-up. The study is expected to contribute to the literature on essential medicine availability, treatment completion, medication adherence, primary healthcare, pharmaceutical services, health systems, healthcare access, and public health in Nigeria by providing empirical evidence on the importance of medicine availability in supporting continuity of treatment. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, National Primary Health Care Development Agency, state ministries of health, state primary healthcare development agencies, local government health authorities, pharmacy departments, healthcare facility managers, pharmaceutical supply-chain stakeholders, development partners, and policymakers regarding strategies for improving medicine availability. The study will also provide evidence-based recommendations for strengthening medicine procurement and distribution systems, improving inventory management, reducing stock-outs, strengthening medicine forecasting and quantification, improving facility-level stock monitoring, ensuring timely funding for essential medicines, strengthening pharmaceutical supply chains, and improving patient counselling and follow-up mechanisms to support treatment completion in Nigerian primary healthcare centres.

Keywords: Essential medicine availability, treatment completion, Nigerian primary healthcare centres, essential medicines, medication adherence, primary healthcare, pharmaceutical services, medicine stock-outs, treatment continuity, healthcare access, health systems, public health.