"Fundamentos De Toxicologia" is a Portuguese-language textbook on toxicology written by Seizi Oga. The book is now in its 4th edition and has become a fundamental resource for students, researchers, and professionals in the field of toxicology. The book provides an in-depth look at the principles and applications of toxicology, covering various aspects of the field, including toxicokinetics, toxicodynamics, and risk assessment.