The Factors Contributing to Expenditures on Over-the-Counter Drugs in South Korea

This study shows that age and chronic disease are the major factors related to using OTC drugs for self-medication for long-term periods. Furthermore, this study suggests that the use of outpatient services is one of the factors associated with purchasing OTC drugs. Considering the potential adverse effects of OTC drugs, communication between physicians and patients should be encouraged at outpatient visits.