Lactulose oral solution can generally drink water after drinking, and does not affect the medication, but should pay attention to the amount of water, should not be excessive. Lactulose oral solution is a blood ammonia-lowering and laxative, and its main ingredient is lactulose, which can be used for the treatment of chronic constipation and hepatic encephalopathy, mainly for the treatment and prevention of hepatic coma or pre-comatose state. This product can usually be taken after drinking water, and will not adversely affect the efficacy of the drug. When used for the treatment of constipation, drinking water after taking the drug is required to achieve the effect of increasing the volume of stool to soften the stool. It should be noted that the first few days of initial treatment with this product may have an adverse reaction of abdominal distension, which usually disappears with continued treatment, but when the dose is higher than the recommended therapeutic dose, adverse reactions such as abdominal pain and diarrhea may occur, and in this case the dose should be reduced or discontinued under the guidance of a physician. In addition, the use of this product should be prohibited for those who are allergic to lactulose and its components and those who have galactosemia, the specific use of the advice to consult a physician or pharmacist, not blindly self-medication.