3INTHERES, Université de Toulouse, INRA, ENVT, Toulouse, France.2Department of Veterinary Medicine, Institute of Pharmacology and Toxicology, Freie Universität Berlin, Berlin, Germany.1The Royal Veterinary College, University of London, London, United Kingdom.Peter Lees 1 † ‡, Wolfgang Bäumer 2 † and Pierre-Louis Toutain 1,3 * † ‡ Possibilities for the Resurgence of Materia Medica as for Herbal Medicine.Posology, Metrology, and the Apothecary System: Factors Limiting the Identification of Correct Drug Doses.Effective Dosage Regimens: Challenges for New Veterinary Drugs.Hormones, Receptors, and Neurotransmitters: The Basis of Functional Pharmacology and Therapeutics: The British Decades.Chemotherapy in Veterinary Medicine Actually Commences with Antiparasitics.The Availability of Chemically Pure Drug Products was Not Synonymous with Improved Therapy: The Case of Aspirin.Evolution of Pharmacology as An Independent Discipline in Human Medicine and Its First Chemotherapeutic Success: The German Connection.