Lactitol is a disaccharide consisting of beta-D-galactopyranose and D-glucitol joined by a 1->4 glycosidic bond. It is used as a laxative, as an excipient, and as replacement bulk sweetener in some low-calorie foods. It has a role as a laxative, an excipient and a cathartic.

Lactitol, also known as 4-β-D-galactopyranosyl-D-glucitol, is a sugar alcohol synthesized from [lactose]. It is used in food manufacturing as a nutritive sweetener and is approximately 35% as sweet as table sugar (i.e. [sucrose]). Clinically, lactitol has been investigated for use as an osmotic laxative and, along with other non-absorbable disaccharides such as [lactulose], in the treatment of hepatic encephalopathy in patients with cirrhosis. Pizensy, an oral lactitol powder for solution, was approved by the FDA for use in chronic idiopathic constipation in February 2020.

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