The law in medicine is a medical encyclopedia divided into five volumes, which was written by the world, the Muslim doctor and philosopher Ibn Sina. The book is considered one of the influential and approved literature in the field of medicine in the world, as it has been used as a basic reference to the teaching of medicine in many universities until the eighteenth century. The book provides an overview of medical knowledge in the era of Islamic civilization, which was affected by the teachings of traditional medicine in previous civilizations such as ancient Roman medicine, such as Galen works, ancient Persian medicine, Chinese and Indian medicine. And explain the appendix and how to remove it, as Ibn Sina revealed many scientific, experimental and laboratory theories. The book of law in medicine is considered one of the most important scientific books, and although it has been developed for nearly ten centuries and before the discovery of many scientific and experimental theories and modern laboratories, it is still the important reference and the basic rule in hospitalization and the installation of medicines.