Lactitol (Lactit) is a agent that acts on the gastrointestinal tract.

Casanthranol is a concentrated mixture of anthranol glycosides derived from the dried bark of Rhamnus p., commonly known as cascara sagrada. This compound serves as a stimulant laxative that is primarily administered to alleviate constipation and other medical conditions. By exerting its effects on the intestinal wall, casanthranol promotes increased muscle contractions, thereby facilitating bowel movements.

Sennoside B is an anthranoid. Anthranoid derivatives are used all over the world as a treatment for constipation.

Anthraquinone (Anthradione)s are the main active constituents in herbs often used to relieve constipation.

Lactulose (Lactulosum) , a synthetic disaccharide , is used in the treatment of constipation and hepatic encephalopathy.