Learning unit: Preclinical trials Impact of the learning unit: This unit aims to introduce the processes of drug research and development before a new medicine enters clinical trials. Physicians are also experts on drugs, and thus, basic information about the preclinical phase of research is considered as general pharmacological knowledge. This information may also help with the future involvement in either academic or commercial preclinical research. Relevant terms life cycle of a drug in silico methods in drug development in vitro techniques of drug testing molecular pharmacology cell line (cell culture) isolated organ animal model experimental animal, species principle of 3R, Project of animal experiments toxicological testing of new drugs acute, subchronic, chronic toxicity lethal dose test skin toxicity mutagenicity, carcinogenicity teratogenicity Learning outcomes The student is able to summarize and explain the course of testing before a new drug enters clinical practice. Student describes the life cycle of a drug. The student is knowledgeable about the issue of preclinical research, explains the aim of animal use in drug development and essential ethic principles. Study materials Rang & Dale's Pharmacology, 8th edition, 2016, chapter 60, pp. 718-722 Study materials for courses aVLFA0721p and aVLFA0721c. Exam questions General pharmacology: 3. Preclinical and clinical trials, stages