[Studies on "Ishin shoden" Edited by Dosan Manase (1507-1594): the introduction of Satsusho Benchi and the process of its establishment].

Sanki Tashiro and Dosan Manase are known for their role as founders of the Gosei-ha school in Japan. Observing that Japanese medicine had not been based on a clear theory, they introduced into Japan the satsusho benchi practiced in Chinese medicine during the Jin and Yuan dynasties. The basis of this system was to examine the patient's condition, then determine the treatment accordingly. Dosan Manase in particular employed the satsusho benchi, writing out a new prescription each time treatment was required, without reference to existing prescriptions. In this study, we carried out an investigation into the "Ishin shoden"edited by Dosan Manase, which reveals the process by which Dosan established the new satusho benchi system of medicine within the framework of traditional Japanese medicine. In the early stages of the process, Dosan prepared prescriptions based on existing iou-tou prescriptions, modifying these by adding or removing medicines. Then, in the middle period, he prepared prescriptions based on toso-tou prescriptions, designed on the basis of the kun shin sa shi or Junchen Zuoshi theory, again modifying these by adding or removing medicines. In the final stage of the process, Dosan ceased this practice of adding or removing medicines from a basic prescription, adopting instead the satusho benchi system of writing out a new prescription for every treatment. In addition, we consider the reasons why the satusho benchi system was not employed by Dosan's successors, and discuss the effects of this.