The third National Symposium on Pharmacotoxicology focuses on public health and environmental protection through a “One Health” approach. This edition explores biosynthesis as innovative, sustainable, and cost-effective alternatives to chemicals, bringing together experts to advance global health and environmental solutions. It also unites researchers, healthcare professionals, and industry experts to discuss the latest developments in pharmacotoxicology, with a focus on the potential of biosynthesis to support global health and economic growth.