Duphalac Syrup is a laxative medication containing lactulose, which helps to treat constipation by softening the stools and increasing the frequency of bowel movements. This syrup works by drawing water into the bowel, making the stool easier to pass and relieving constipation. Duphalac Syrup is suitable for adults and children and can also be used to treat hepatic encephalopathy, a liver-related condition.