same time the last great Greek Roman pharmacist. He was a great expert in the use, preparation and compilation of medicines. The best source of knowledge of his pharmacology is the book "De simplicium medicamentorum temperamentis et facultatibus". But other books can be considered an ancient "pharmacopoeia". These are the ones from the year 160 "De compositione medicamentorum sectmdum genera" and "De compozitione medicamentorum secundum locos". About 500 herbal drugs and a considerable number of mineral and animal drugs are described in the aforementioned books. He also wrote the book "De Antidotis". Galen's books are preserved in a series of Greek, Latin and Arabic medieval manuscripts. They are then often published, so the number of printed editions is great. The first printed edition was published in Latin in1515 in Erfurt as the son of Eurosis Cordus, a Marburg professor of medicine. He studied in Marburg and Wittenberg. At the last university in Wittenberg in 1540 he read about Dioscuri. Scientific literature on the life and book of Valerius Cordus is very extensive. Georg Edmund Dann has specifically explored this area of pharmacy history. He argues that Dioskurides approach was not just based on reason or well-conceived and practical (rational), as well as based on experience, or knowledge gained (empirical). It is also critical, or it rests on a strict observation of specific criticism and its criteria. He therefore deserves to be recognized as the beginning of the science of pharmacognosy and pharmacology. His drug classification was based on their expected physiological effect and this activity