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Impact of Drug Information Services on Rational Medicine Use among Adults in Nigeria

Abstract

Rational medicine use is an important component of effective healthcare because medicines should be used appropriately, safely, and effectively according to patients' health needs, prescribed doses, treatment duration, and relevant clinical guidance. Inappropriate medicine use among adults may result in treatment failure, adverse drug reactions, drug interactions, antimicrobial resistance, unnecessary expenditure, and other preventable health problems. Drug information services provide patients and healthcare users with reliable information about medicines, including indications, dosage, frequency, duration of treatment, contraindications, precautions, adverse effects, drug interactions, storage requirements, and appropriate medicine use. However, limited access to reliable drug information, self-medication, misinformation, inadequate patient counselling, and dependence on informal sources may contribute to inappropriate medicine use in Nigeria. Against this background, this study investigates the impact of drug information services on rational medicine use among adults in Nigeria. The study will be anchored on the Health Belief Model, Health Literacy Framework, and Andersen's Behavioral Model of Health Services Use. The Health Belief Model explains how adults' perceptions of medication-related risks, perceived benefits of obtaining reliable drug information, perceived barriers, and cues to action may influence medicine-use behaviour. The Health Literacy Framework emphasizes individuals' ability to access, understand, evaluate, and apply medicine-related information to make appropriate health decisions. Andersen's Behavioral Model explains how predisposing characteristics, enabling resources, and perceived healthcare needs influence utilization of drug information and healthcare services. Collectively, these theoretical perspectives provide a suitable framework for explaining how drug information services may influence rational medicine use among adults in Nigeria. The study will adopt a quantitative analytical cross-sectional or quasi-experimental research design. The study population will comprise adults aged 18 years and above accessing healthcare services, community pharmacies, primary healthcare centres, hospitals, and other medicine-related services across Nigeria. A multistage sampling technique will be used to select geopolitical zones, states, local government areas, communities, healthcare facilities, pharmacies, and eligible adults. Drug information services will be assessed using indicators such as availability and accessibility of drug information, frequency of information received, counselling on dosage and frequency, treatment duration, indications, contraindications, adverse effects, drug interactions, storage conditions, missed-dose instructions, medicine adherence, and opportunities to ask questions. Rational medicine use will be assessed using indicators such as use of medicines for appropriate indications, correct dosage, appropriate frequency and duration, adherence to prescribed instructions, avoidance of unnecessary medicines, avoidance of inappropriate self-medication, checking for potential drug interactions, appropriate antibiotic use, compliance with professional advice, and timely consultation with healthcare professionals when medication-related problems occur. Data will be collected using structured questionnaires, validated medicine-use assessment instruments, drug information service records, prescription records, pharmacy records, and relevant healthcare documents. Descriptive statistics will be used to summarize participants' characteristics, exposure to drug information services, and patterns of medicine use. Inferential statistical techniques, including chi-square tests, correlation analysis, and logistic or multiple regression analysis, will be used to determine the impact of drug information services on rational medicine use. Where a quasi-experimental design is adopted, rational medicine-use scores before and after exposure to structured drug information services may be compared to determine changes associated with the intervention. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that drug information services have a significant positive impact on rational medicine use among adults in Nigeria. Adults who receive accurate, accessible, and understandable drug information are expected to demonstrate better knowledge and practices regarding appropriate medicine use than adults who have limited access to reliable information. Drug information services may improve understanding of prescribed medicines, reduce inappropriate self-medication, promote adherence to treatment instructions, increase awareness of adverse effects and drug interactions, and encourage consultation with qualified healthcare professionals when medication-related concerns arise. Accessible counselling from pharmacists and other healthcare professionals may also help adults distinguish reliable medicine information from misinformation obtained from informal sources. However, low health literacy, language barriers, limited availability of qualified healthcare professionals, cost of professional counselling, self-medication practices, misinformation, and limited access to reliable drug information services may reduce their effectiveness. The study therefore expects accessible, accurate, patient-centred, and culturally appropriate drug information services to contribute significantly to improved rational medicine use among adults in Nigeria. The study is expected to contribute to the literature on drug information services, rational medicine use, medication safety, pharmaceutical care, health literacy, medicine adherence, self-medication, patient counselling, and public health in Nigeria. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, Pharmacy Council of Nigeria, National Agency for Food and Drug Administration and Control, hospitals, primary healthcare centres, community pharmacies, pharmacists, physicians, nurses, public health educators, development partners, and policymakers regarding strategies for promoting safe and appropriate medicine use. The study will also provide evidence-based recommendations for strengthening drug information services, improving patient counselling, expanding access to qualified pharmacists and other healthcare professionals, developing accessible medicine information materials, integrating drug information into routine healthcare services, and promoting rational medicine use among adults across Nigeria.

Keywords: Drug information services, rational medicine use, adults, medication safety, pharmaceutical care, health literacy, medicine adherence, patient counselling, self-medication, drug information, Nigeria, public health.