The contraindications of magnesium sulfate bowel cleansing are gastrointestinal bleeding, pregnant women and central inhibiting drug poisoning and other conditions. 1. Gastrointestinal bleeding: If patients with gastrointestinal bleeding use magnesium sulfate purging, it will aggravate the absorption of large amounts of water into the tissues, which will aggravate gastrointestinal bleeding, therefore, gastrointestinal bleeding is prohibited to use magnesium sulfate purging. 2. Pregnant women: if patients use magnesium sulfate purging during pregnancy, it will cause uterine contraction, magnesium sulfate is not absorbed, it will aggravate the osmotic pressure, so that the newborn baby hypermagnesemia, so pregnant women are forbidden to use magnesium sulfate purging. 3. Intestinal bleeding patients, patients with acute abdomen and pregnant women, menstruating women are prohibited to use this product for diarrhea. 4. Central inhibitory drugs (such as phenobarbital) poisoning patients to eliminate the poison should not use this product diarrhea, in order to prevent aggravation of central inhibition. Allergic to magnesium sulfate is prohibited, the use of drugs please follow the doctor’s instructions. If you feel unwell, please go to the hospital in time, under the guidance of the doctor to actively cooperate with the examination, to avoid delaying the condition.