NCIt definition : A disaccharide (sugar) synthesized from fructose and galactose, Lactulose is used
to treat constipation and some liver diseases. Nondigestible in mammals, lactulose
passes unabsorbed down to the large intestine where resident bacteria consume it and
produce lactic, acetic, and formic acids, which draw fluid into the bowel to soften
the stool (laxative effect). Acidification of the colon contents attracts ammonia
from the bloodstream, assisting stool excretion; helpful in liver failure when ammonia
cannot be detoxified. (NCI04);