This book details the combination rules, essential of the effects, and clinical application of formulas. It discusses the core of the science of herbal formulas and essentials effects of combinations in formulas from the change of action after combinations in Chinese medicine. This book provides scientific analysis of 18 types of formulas, presents the rules of proper combining, and clarifies the mechanisms of medicinal combination. The effects of dosage and the physiology of the treatment are also explained. It also applies the scientific results of clinical research, experimental studies, and the pharmacology and chemistry of the modern formulas.