Lactulose (IPA: ˈlæktjʊləʊz)'s a synthetic sugar used in the treatment of constipation and hepatic encephalopathy, a complication of liver disease. It's a disaccharide (double-sugar) formed from one molecule each of the simple sugars (monosaccharides) fructose and galactose. The commercial syrup used for treatment of constipation's dyed yellow-orange. It's produced commercially by isomerization of lactose. Constipation In the treatment of chronic constipation, the metab… (More on Lactulose)