Lactulose can drink water immediately after drinking, but it is not recommended to drink a large amount of water, which may cause abdominal distension and electrolyte disorders. Although these situations do not usually occur, for safety reasons, it is recommended to follow medical advice on diet during medication. First of all, drinking large amounts of water may cause abdominal distension due to large accumulation of fluid in the gastrointestinal tract; secondly, lactulose has an osmotic conductive effect, which may cause the loss of electrolytes such as sodium and chloride in the body, and if you drink large amounts of water again, too much water will enter the body and dilute the blood, which will further reduce the concentration of electrolytes in the blood and may lead to conditions such as hyponatremia, manifested as headache, drowsiness, weakness, nausea, consciousness Symptoms such as unclear. Therefore, lactulose can drink moderate amounts of water after drinking, but it is not recommended to drink a lot of water, generally do not exceed 2.5L, but also need to pay attention to replenish electrolytes, can be replenished by moderate intake of salt, fresh fruits, vegetables, to replenish electrolytes. In addition, some people believe that drinking large amounts of water may dilute lactulose and affect the effectiveness of the drug. During the use of lactulose, it is necessary to follow the doctor’s prescription, and it is strictly forbidden to increase or decrease the dosage by oneself to avoid the incidence of adverse reactions. If other medications are used at the same time as lactulose, it is recommended to consult a doctor before taking it, and no other light laxatives should be used during treatment to avoid diarrhea. If symptoms do not improve significantly or appear intermittently after taking lactulose for 2-3 days, consult your doctor whether to change the medication or increase the dosage of treatment. Diabetic women and women during pregnancy need to take it under the guidance of a doctor.