ABSTRACT
Ryokito is a Kampo formulation which has been administered for right upper quadrant pain since the Edo Era in Japan. Yet there are but a few reported cases in multiple clinical exams at one institution, on the usage of this formulation. We undertook a precise retrospective analysis of ryokito-prescribed cases at our institute over ten years, and reported cases published in the past to illuminate the clinical characteristics of ryokito effective cases. <br>Among the 21 cases at our institute, ryokito was effective in 11 cases and 10 of these 11 cases had right upper quadrant pain. Additionally, 7 of them reported abdominal distention. <br>Overall, this retrospective analysis revealed that amongst those ryokito effective cases, not a few patients had the right upper quadrant pain. This fact suggests that right upper quadrant pain is a reasonable characteristic for a usage of ryokito. <br>Likewise, abdominal distention was also a common symptom among the effective cases. It is likely that abdominal distention could be a characteristic for a usage of ryokito as well.