To enhance stone elimination following extracorporeal shock wave lithotripsy (ESWL), we administered Tsumura Chorei-to to 74 patients who underwent the procedure at Kinki University School of Medicine and Kanbara Hospital between July 1990 and March 1991. We established a control group of 75 patients without medication. There was no significant difference between the two groups in terms of gender, age, stone size (mostly less than 20 mm), and stone position. The mean number of days required for complete stone elimination was 16.0 days in the Chorei-to administration group being significantly shorter than the 21.5 days in the control group (p < 0.001). These findings suggested that Chorei-to effectively enhanced the spontaneous discharge of fragmented stones following ESWL.