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Impact of Essential Drug 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 depend on consistent access to appropriate, safe, affordable, and quality-assured medicines to complete prescribed treatment. Essential drug availability refers to the consistent presence of appropriate medicines in adequate quantities, at the required time, and in suitable dosage forms within healthcare facilities. Treatment completion refers to the extent to which patients take or use prescribed medicines for the recommended duration and according to healthcare providers' instructions. In Nigerian primary healthcare centres, shortages and stock-outs of essential medicines may interrupt treatment, require patients to purchase medicines from external sources, encourage dose reduction or discontinuation, or result in incomplete treatment. Such interruptions may reduce the effectiveness of treatment, increase the risk of disease persistence or complications, and contribute to avoidable healthcare utilization. Conversely, reliable availability of essential drugs within primary healthcare facilities may facilitate uninterrupted treatment and improve patients' ability to complete prescribed therapeutic regimens. Against this background, this study investigates the impact of essential drug availability on treatment completion among patients in Nigerian primary healthcare centres. The study is anchored on Donabedian's Structure-Process-Outcome Model, the Theory of Access to Healthcare, and Andersen's Behavioral Model of Health Services Use. Donabedian's Model identifies the availability of medicines as an important structural component of healthcare that can influence treatment processes and patient outcomes. The Theory of Access to Healthcare emphasizes the importance of availability and accessibility of healthcare resources in enabling individuals to obtain appropriate care. Andersen's Behavioral Model explains healthcare utilization through predisposing characteristics, enabling resources, and healthcare needs, with the availability of essential medicines representing an important enabling resource. Collectively, these theoretical perspectives provide a suitable framework for explaining how essential drug availability may influence patients' ability to complete prescribed treatment in Nigerian primary healthcare centres. The study will adopt a quantitative cross-sectional research design. Primary data will be collected from selected Nigerian primary healthcare centres using structured facility assessment checklists, patient questionnaires, pharmacy or dispensary records, medicine stock records, and treatment documentation. A multistage sampling technique will be employed to select states, local government areas, communities, primary healthcare centres, healthcare workers, and eligible patients receiving treatment for selected conditions. Essential drug availability will be assessed using indicators such as availability of essential medicines, stock levels, frequency and duration of medicine stock-outs, adequacy of medicine quantities, availability of appropriate dosage forms, procurement and replenishment practices, storage conditions, and accessibility of medicines to patients. Treatment completion will be assessed using indicators such as completion of prescribed treatment duration, adherence to prescribed dosage, frequency of treatment interruption, missed doses, treatment discontinuation, and availability of follow-up treatment information. Where feasible, pharmacy records, stock cards, dispensing registers, prescription records, and patient treatment records will be reviewed to complement self-reported information and improve measurement accuracy. Additional information will be collected on patients' age, sex, educational level, income-related characteristics, type of illness, duration of treatment, distance to the healthcare facility, medicine costs, and previous treatment experience. Descriptive statistics will be used to summarize medicine availability, stock-out patterns, patient characteristics, and treatment-completion levels. Inferential statistical techniques, including chi-square tests, correlation analysis, and logistic or multiple regression analysis, will be used to determine the impact of essential drug 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 greater availability of essential drugs has a significant positive impact on treatment completion among patients in Nigerian primary healthcare centres. Patients receiving care in facilities where prescribed medicines are consistently available are expected to have higher treatment-completion rates than patients attending facilities experiencing frequent or prolonged medicine stock-outs. Consistent medicine availability is expected to reduce treatment interruptions, decrease the need for patients to seek medicines from alternative sources, and improve continuity of prescribed therapy. Conversely, frequent stock-outs may force patients to postpone treatment, purchase medicines from private pharmacies or informal sources, reduce prescribed doses, or discontinue treatment prematurely because of financial or logistical difficulties. Reliable availability of medicines may also strengthen patients' confidence in primary healthcare services and encourage continued use of recommended treatment. However, medicine availability alone may not fully determine treatment completion because treatment duration, adverse effects, patients' understanding of treatment instructions, medicine costs, accessibility, healthcare provider communication, and individual patient circumstances may also influence completion. Therefore, improving medicine availability should form part of a broader strategy for strengthening primary healthcare and treatment continuity. The study is expected to contribute to the literature on essential medicine availability, treatment completion, medication use, primary healthcare, pharmaceutical services, healthcare access, treatment continuity, and public health in Nigeria by providing empirical evidence on the importance of reliable medicine supplies in supporting completion of prescribed 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, pharmaceutical services departments, primary healthcare managers, pharmacists, pharmacy technicians, healthcare workers, development partners, and policymakers regarding strategies for improving medicine availability. The study will also provide evidence-based recommendations for strengthening medicine procurement and forecasting, improving stock monitoring and inventory management, reducing stock-outs, strengthening medicine distribution systems, improving storage facilities, ensuring timely replenishment, monitoring essential drug availability, and strengthening accountability for pharmaceutical supply management in Nigerian primary healthcare centres.

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