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Home -> Single Herb Library -> Xie Xia Yao -> da huang

Qing Re Yao

--> Gong Xia --> da huang

Pin-yin:	da huang

English name:	Rhubarb root

Where grown:	West, south and central China.

Source:	The dried rhizome of Rheum palmatum L. and its family.
Ingredients:	Chrysophanol, Rheumemodin, Sennoside, Heterodianthrone, Chrysophanein, 2-O-Cinnamoyl-l, 6-di-O-galloyl-ß-D-glucoside, Rhatannin
Pharmacological effect:	1) Laxative effect: oral ingestion of the herbal extract has a laxative effect on small white mice. The extract has no impact on carbon particle transportation in the small intestine, but stimulates the excretion of the particle. Neither has it any effect on the liquids in the small intestine, but it increases the water in large intestine. Intake of the extract via injection has no such effect. The laxative effect is unrelated to blood flow, but due to the direct intestinal stimulation and water increase from the extract. 2) Effect on decreasing blood serum urea nitrogen: the abdominal injection of rhatannin on rabbits reduces blood serum urea nitrogen. The anti-microbial ingredients may be attributed to rhein and emodin. The water extract also has an antiviral effect.

Properties:	Bitter, cold

Channels entered:	Spleen, stomach, large intestine, heart

Function:	Dispels accumulation in stomach and intestines, drains excessive heat in the blood, regulates blood flow, benefits the bone joints, dispels stasis in the abdomen and facilitates urination and defecation.

Major Clinic Usage:	For food stagnation, constipation due to excessive heat, dysenteric disorders, blood stasis, mass in the abdomen, red, painful eyes, edema, jaundice, urinary retention, and swollen, hot and painful skin lesions.
Cautions:	Use with caution during pregnancy.

Usage and Dosage:	3~12g. Do not overcook the herb (not more than 10 minutes) to use as a laxative. Use externally with proper dosage. Apply powder to the wounds.

Storage:	Store in a dry, well-ventilated place. Protect from worm infestation.

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