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Senna
Two
varieties of Senna exist, Cassia angustifolia (native to
India, Pakistan and China) and Cassia acutifolia, (grown in
North Africa). Both are used in herbal medicine, where either the
pods or leaves are harvested. Senna's main use as a laxative has
remained unchanged for centuries.
The Benefits of Senna
Relief of constipation can reduce feelings of
fatigue, muscle and joint discomfort, intestinal discomfort and
bloating, skin conditions and headaches associated with chronic
constipation. Senna was shown to be more effective in one trial than
the same dose of polyethylene glycol (PEG), a drug used to prepare
the bowel for surgery.
Main uses of Senna:
Constipation
Bowel surgery preparation (under supervision)
Properties
Hydroxyanthracene glycosides (also known as
anthraquinones), found in Senna leaves and pods are known to have
several complimentary effects that account for Senna's laxative
properties. The anthroquinones found in Senna, called sennosides A
and B, appear not only to stimulate peristalsis (movement of the
bowel muscles), but speed colonic function generally and reduce the
loss of water from the bowel to the body, so keeping the faeces
soft.
Senna also contains around 10% mucilage, which can
offer a soothing quality, and
tartrates, which are responsible for the retention of fluid in the
gut.
Contra-indications / Precautions
Long term use of Senna can cause excessive losses of
fluids and potassium, which may lead to dehydration. Habituation can
occur during long term use, resulting in dependency. This can be
avoided by using the lowest dose that is effective and using Senna
for no more than 10 consecutive days. Senna is not suitable for
children, but standardised Senna tablets may be used after the first
3 months of pregnancy, as their effects are predictable.People with
inflammatory bowel disorders, appendicitis, intestinal obstructions
or abdominal
pain should not use Senna.
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