What is the primary action of bulk forming laxatives?

The primary action of bulk-forming laxatives is to absorb water and expand stool bulk. These laxatives contain natural or synthetic fibers that swell in the intestine when they come into contact with water. This swelling increases the volume of the stool, which stimulates bowel movements by promoting peristalsis, the wave-like muscle contractions that move food through the digestive tract.

By increasing the bulk of stool, bulk-forming laxatives help to soften it, making it easier to pass and alleviating constipation. They are often recommended as a first-line treatment for constipation because they work with the body’s natural digestive processes. Additionally, since they do not have a direct action on the bowel muscles, they are generally considered safe for long-term use and can also contribute to overall digestive health.