<qa>  How many cases of IBS were treated?The author tried to compare previous drugs to shigyakusan. 7.5g per day of Tsumuras shigyakusan Tsumura Co was administered to each of 30 cases of IBS to whom Trimebutine maleate, Polycarbophil calcium and Oxapium iodide had been described, and was administered to each of 18 cases of new patients of IBS and 21 cases of existing patients first treated as IBS.Table2 These patients were diagnosed as IBS by Rome III and abdominal N line tenderness, undermentioned in Regarding abdominal tenderness of N line Table 6. 