When to take senna granules is not clearly specified in the instructions. Senna granules are mainly composed of senna leaves, which have the effect of diarrhea heat and stagnation, laxative. The drug can be used for the treatment of constipation, in addition, clinically can also be used for bowel cleansing preparation before intestinal surgery, endoscopy, ultrasound, abdominal X-ray film examination. The adverse effects of the drug are not known, but it is contraindicated in patients with complete intestinal obstruction. For pregnant women, diabetic patients should be used with caution. At the same time, avoid eating cold, spicy and greasy food during the administration of the drug. If it is used for surgery and all kinds of pre-test preparation, drinking water should not be less than 400ml after taking the medicine, and the diet should be routinely controlled according to the needs of surgery. Before using Senna Granules, it is recommended to go to a regular hospital for consultation and treatment under the guidance of a professional physician for evidence-based treatment.