Antiviral drugs, in particular those used to treat COVID-19, have been categorized as emerging pollutants in recent years due to their persistent presence in water/wastewater. They have been identified in environmental matrices all over the world, proving that current treatment methods cannot eliminate them from water/wastewater. In this study, the degradation of favipiravir (FAV) and ecotoxicity changes in different water matrices were investigated using the UV, UV/H