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lac·tu·lose | \ ˈlak-t(y)u̇-ˌlōs 
, -ˌlōz \
, -ˌlōz \Medical Definition of lactulose
: a synthetic disaccharide C12H22O11 used as a laxative for chronic constipation and as an acidifier to reduce blood ammonia levels causing neurological symptoms in advanced liver disease
Note: Lactulose is used in solution for oral or rectal administration.
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