Magnesium sulfate drink not defecate with the amount of medicine is not enough, vomiting and other factors. Long-term bad habits, often eat spicy, irritating food, not only will cause irritation to the mucosa of the gastrointestinal tract, but also lead to the phenomenon of intestinal fire. The food cannot be discharged quickly after intake, so it will accumulate in the intestines to form constipation. To prevent hemorrhoids or anal fissures, you can take laxative drugs by mouth. After taking magnesium sulfate orally, it can soften the stool by increasing the internal osmotic pressure inside the intestine and absorbing water, which can facilitate the discharge of stool. Some people still can not defecate after taking magnesium sulfate, mainly consider taking the drug when the amount of medicine is not enough related. If the patient does not appear abdominal pain, vomiting and other uncomfortable performance, can be combined with the doctor’s advice to increase the amount of medication to take. If the performance of vomiting, abdominal distension and pain after taking the drug, the drug will be discharged outside the body with the vomit, so it will also make the drug not play the efficacy of the drug.