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.
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.
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.
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.