In response to growing concern, this book examines the current methods for evaluating the potential risks of veterinary medicines to aquatic and terrestrial ecosystems. It brings together more than 30 experts from eight countries who provide guidance on standard risk assessment approaches for assessing the environmental effects of veterinary medicines. The text discusses pathways to the environment, exposure and effects assessment, and risk assessment and management. It reviews classes of veterinary medicines and current regulations, identifies the environmental fate of the medicines, and assesses the use of modeling approaches.