Active constituents:
Cascara bark is high in hydroxyanthraquinone glycosides called cascarosides. Resins,
tannins, and lipids make up the bulk of the other bark ingredients. Cascarosides have a
cathartic action, inducing the large intestine to increase its muscular contraction
(peristalsis), resulting in bowel movement.2
How much should I take?
Only the dried form of cascara should be used. Two capsules containing dried cascara can
be taken up to two times per day. As a tincture, 1-5 ml per day is generally taken. It is
important to drink eight 6-ounce glasses of water throughout the day. Cascara should be
taken for a maximum of eight to ten days.3
Are there any side effects
or interactions? Women who are pregnant or lactating should not use cascara
without the advice of a physician. Those with an intestinal obstruction should not employ
this herb. Long-term use or abuse of cascara may cause a loss of electrolytes (especially
the mineral potassium0 or weaken the colon. Loss of potassium may potentiate the action of
digitalis-like medications with fatal consequences.
References:
1. Castleman M. The Healing Herbs. Emmaus, PA: Rodale
Press, 1991, 99–100.
2. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs,
and Cosmetics, 2d ed. New York: John Wiley & Sons, 1996, 128–30.
3. Bradley PR,ed. British Herbal Compendium, vol 1. Bournemouth, Dorset, UK:
British Herbal Medicine Association, 1992, 52–4.
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