Hello, you should eat vegetables and fruits rich in crude fiber and drink plenty of water and drinks to treat constipation. Eat more foods rich in B vitamins and moistening intestines, and avoid alcohol, strong tea, peppers, coffee and other foods. It is recommended to take oral lactulose solution with lactulose content of 66.7g/ 100ml, which can regulate the circadian rhythm of colon and play a role as a prebiotic. The initial dose for adults is 30 ml per day, and the maintenance dose is 10-25 ml per day. This product should be taken once at breakfast. You can also use kaisai dew when necessary.