Used as a stimulant laxative to treat constipation by increasing bowel movement. It works by stimulating the nerves in the colon to promote muscle contractions, helping move stool through the intestines. Often found in herbal remedies derived from senna plant extracts. Commonly used in over-the-counter medications for short-term relief of constipation. Also used in bowel preparation before medical procedures such as colonoscopies to ensure clear intestines.