Considered one of the herbal laxatives, senna (Cassia senna or Cassia angustifolia), is a common ingredient in teas as well as capsule and tablet preparations. Senna leaves contain the active ingredients sennoside A and B, and also small amounts of free anthroquinones. Sennosides are generally cathartic, but can also be purgative (stimulation of peristalsis).
For most people, senna can act as a short-term
laxative, for the temporary relief of
constipation. Long-term use of this, or any laxative, is not usually recommended without supervision of a physician. Chronic abuse can lead to a variety of complications such as chronic
diarrhea with nutrient loss and excessive
electrolyte loss/imbalance. Enlargement of the ends of the fingers and toes and pigmentation of the
colon can also occur from overuse.
Although uncommon, allergic reactions to senna have been reported. Stop taking senna and seek emergency medical attention if you experience symptoms of a serious allergic reaction including
difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or
hives.