The book contains lectures by Prof. Farrington, read by him at the Philadelphia Homeopathic College and translated into Russian by the famous homeopath, Doctor of Medicine, Lutsenko. These lectures are considered one of the world's best textbooks on pharmacodynamics and have long become classics. The book summarizes the experience of many homeopaths, collects extensive material on the drugs used in homeopathy and provides a detailed analysis of their properties and indications for use. A huge number of examples from medical practice are given with a subtle analysis of the quality of diagnosis and treatment. The material is presented in simple language, successfully systematized and understandable to a wide audience. For a practicing homeopath, the book will undoubtedly be an invaluable assistant.