Is lactulose effective for treating constipation?

Generally, common formulations of lactulose include lactulose concentrated solution and lactulose oral solution. The effectiveness of lactulose in treating constipation mainly depends on the type of constipation. For mild to moderate chronic functional constipation, lactulose is usually effective; however, for constipation caused by intestinal obstruction or impaired intestinal motility, lactulose may not be effective. Detailed analysis is as follows:

Lactulose is an osmotic laxative whose main component is a disaccharide formed by galactose and fructose. It has low absorbability in the intestines, effectively increasing the osmotic pressure of intestinal contents. This draws water into the intestinal lumen and retains it, thereby softening stools and facilitating smoother bowel movements. For mild to moderate chronic functional constipation, lactulose typically improves symptoms effectively. It is particularly beneficial in cases of constipation caused by insufficient dietary fiber or inadequate fluid intake, providing noticeable relief.

If constipation results from intestinal obstruction or dysmotility, lactulose treatment is generally unsatisfactory. In such cases, more targeted therapeutic approaches are required. Additionally, long-term and excessive use of lactulose may lead to adverse effects such as diarrhea, abdominal pain, and bloating, which could worsen constipation or trigger other health issues.

In daily life, attention should be paid to lifestyle modifications, such as increasing dietary fiber intake, drinking adequate amounts of water, developing regular bowel habits, and engaging in moderate physical activity, to fundamentally improve constipation.