Objective To explore the mech anism of Gonghuanzhixue Tablets for t reating endometr orrhagia caused by Cu-IUD. Methods In contrast with Indomet hacin,we investigated the effe cts of Gonghuanzhixue Tablets on the indices such as blood sedimentation,hematoc nit ,total blood viscosity (low,middle,high)and serum viscosity in CU-IUD-weari ng rabbits. Results Gonghuanzhixue Tablets can decrease HCT,total b l ood and serum viscosity and improve blood rheology. Conclusion Th e results suggest that the chan ge of the blood rheology may be part of the mechanism of Gonghuanzhixue Tablets preventing and ...