Used primarily as a stimulant laxative to treat constipation. It works by increasing bowel movements through irritation of the intestinal lining and promoting fluid secretion into the intestines. Commonly found in herbal remedies derived from senna plant extracts. Often used in over-the-counter constipation treatments, especially for short-term relief. Also utilized in bowel preparation before medical procedures such as colonoscopies. Its action is delayed, typically taking 6 to 12 hours to produce results, making it suitable for overnight use.