Lactulose is a drug primarily used in the treatment of constipation. As a laxative, Lactulose works by drawing water into the stools, thereby loosening them and making them easier to pass through the intestines. However, the function of Lactulose also extends to patients at risk of hyperammonemia. This is a condition where the body has elevated levels of ammonia, which may lead to hepatic encephalopathy. Lactulose works at the level of the intestine where it prevents the absorption of ammonia by de-coupling it through a chemical reaction. One of the major benefits of Lactulose is its tolerable side-effect profile coupled with the fact that there are no major drug interactions.