Normal patients usually do not have black stools after taking Si Xie Wan. If black stools occur, it is usually related to eating blood products or gastrointestinal bleeding, etc. Patients are advised to go to the hospital in time to get a clear picture of the cause of the disease. Four elimination pill has the effect of eliminating water, eliminating food, guiding the stagnation of bowel movement, etc. It is mainly used for the treatment of qi, food, phlegm, water and other stagnation of the accumulation of water, resulting in chest and epigastric tightness, abdominal distension and pain and other symptoms. The discharge of black stools will not normally occur. Taking the four elimination pills will not appear in the case of black stool, shoot black stool is mostly related to the upper gastrointestinal tract bleeding or eating blood products, the patient if eating blood products after black stool, no discomfort symptoms, after a period of time can disappear on their own, pay attention to observation. If the cause of eating blood products is excluded, accompanied by abdominal pain, anorexia, anemia and other abnormal symptoms, it is recommended to go to the hospital in time to improve the relevant examination, to clarify the cause of the disease.