The regulatory effects of Gorei-san (Wu-Ling-San) on circulatory, metabolic and diuretic function were investigated analyzing the perioperative transition of serum sodium levels, peripheral platelet counts and urinary 6-keto-prostaglandin F₁α levels in fifty-eight female patients who underwent cholecystectomy because of cholelithiasis or gallbladder polyps.
The endothelial cells were considered to be activated by administration of Goreisan as shown by an increase of prostaglandin I₂ production, resulting in circulatory and metabolic stimulation and partly promotion of diuretic function by a dilatation of the renal vessels. The urinary 6-keto-prostaglandin F₁α, a metabolite of serum prostaglandin I₂ and also excreted by the interstitial cells in the renal medulla or by the epithelial cells of the renal collecting tubules, was considered to regulate diuretic function through suppressing the antidiuretic hormone.
The phenomena mentioned above were not recognized when Sho-saiko-to (Xiao-Chai-Hu-Tang) was administered instead of Gorei-san.

Female patients suffering from gallbladder stone disease were administered Sho-saiko-to (Xiao-Chai-Hu-Tang), Gorei-san (Wu-Ling-San) or Toki-shakuyaku-san (Dang-Gui-Shao-Yao-San) preoperatively, and were examined by cholangiomanometry during operation. Perfusion pressure was significantly elevated, when Sho-saiko-to or Gorei-san were administered, meaning that the pressure threshold of the sphincter of Oddi for volume load in the bile duct was lowered. This phenomenon tended to be more obvious in Gorei-san group, and will prevent duodenal fluid from transpapillary reflux. Parameters concerning the declining curve (T_1/2, T_1/4, T_1/5) showed a significantly rapid relaxation of the sphincter of Oddi only in Sho-saiko-to group, which will result in a prevention of stasis of bile. These modulating functions of Sho-saiko-to and Gorei-san for the sphincter of Oddi would be one of the main reasons why these formulas are used for hypochondriac fullness and distress or excessively accumulated intestinal fluid. Toki-shakuyaku-san showed no such effects on the sphincter of Oddi.