Lilac syrup, which contains lactulose with other sugars eg, galactose and lactose, is used in the treatment of constipation and hepatic encephalopathy. Lactulose is a disaccharide, a sugar molecule composed of 2 smaller sugar molecules bonded together, in this case, fructose and galactose. Lactulose is a solid substance that is very soluble in water and has a sweet taste. It is sweeter than lactose but not as sweet as fructose. Chemically, lactulose is also known as 4-O-β-D-galactopyranosyl-D-fructofuranose. The molecular formula is C12H22O11 with a molecular weight of 342.3 daltons.
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