lactulose

Chemistry, Medicine, Natural sciences, Organic chemistry, Pharmacology, Physical sciences, Sciences A synthetic disaccharide C₁₂H₂₂O₁₁ consisting of galactose and fructose units, used as a laxative for chronic constipation and as an acidifier to reduce blood ammonia levels causing neurological symptoms in advanced liver disease. It is used in solution for oral or rectal administration.