Lactulose adults usually need to take it for one to three days, depending on the individual. Lactulose is a laxative with a yellowish, clear, viscous body, mainly for chronic or habitual constipation, hepatic encephalopathy, but the drug is contraindicated in cases of galactosemia, allergy to lactulose, and if other laxatives are already used. Adverse reactions such as bloating may occur when taking the drug, and there is a risk of electrolyte disorders occurring as a result of diarrhea when taking large doses over a long period of time. It should be noted that after two or three days of treatment, if there is no change in symptoms, you should consult a physician. Therefore, adults usually need to take lactulose for one to three days. Lactulose has an adverse reaction of electrolyte disorders, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.