Understanding Underreporting of Adverse Drug Reactions in the Philippines: A Mixed Methods Study.

Background: Adverse drug reaction (ADR) reporting is a crucial element in ensuring medication safety and effective pharmacovigilance. However, underreporting of ADRs remains a significant challenge in the Philippines despite efforts made by the national pharmacovigilance center (NPVC). This study aims to explore the factors contributing to underreporting of ADRs among healthcare professionals (HCPs) in the Philippines, with a focus on understanding their knowledge, attitudes, and practices (KAP), as well as evaluating the usability of the online ADR reporting system.