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Pinyin Name: Bian Xu
Alternate Chinese Names: Bian Zhu, Dao Sheng Cao,
Niu Bian Cao Original Source: Shen Nong Ben Cao Jing (Divine
Husbandman's Classic of the Materia Medica) in the second century
English Name: common knotgrass herb
Botanical Name: Polygonum aviculare L. (Bian Xu)
Pharmaceutical Name: Herba Polygoni Avicularis
Properties: bitter, cool Channels Entered: Urinary Bladder
Lin zheng (dysuria syndrome): Bian Xu (Herba Polygoni Avicularis) dispels damp-heat and promotes urination. It is commonly used to treat re lin (heat dysuria) with burning and pain. It also is effective in treating urethral calculi.
• Eye redness and pain: use Di Fu Zi as a tea with ]ue Ming Zi (Semen Cassiae), QingXiangZi (Semen Celosiae) and Gu fing Cao (Flos Eriocauli).
DOSAGE
10 to 15 grams.
CHEMICAL COMPOSITION
Oleanolic acid, ecdysteroid, triterpenoid saponins, alkaloids. 1
PHARMACOLOGICAL EFFECTS
• Antibiotic: Water extract of Df Fu Zi has an inhibitory effect with Xiao Ji (Herba Cirisii), Pu Huang (Pollen Typhae) and Bai Mao Gen (Rhizoma Imperatae).• Shi lin (stone dysuria) with kidney stones: use it with Jin Qian Cao (Herba Lysimachiae) and Hai Jin Sha (Herba Lygodii).
Jaundice: Bian Xu treats jaundice caused by the accumulation of damp-heat in the Liver and Gallbladder.
• Jaundice: use this herb with Da Huang (Radix et Rhizoma Rhei), Yin Chen Hao (Herba Artemisiae Scopariae) and Zhi Zi (Fructus Gardeniae).
Parasites: Bian Xu kills parasites, especially roundworm and hookworm.
• Parasites: use the vinegar-fried form of Bian Xu with Shi Jun Zi (Fructus Quisqualis), Wu Mei (Fructus Mume) and Hua Jiao (Pericarpium Zanthoxyli).
• Anal itching caused by parasites: use Bian Xu decoction as a topical wash.
• Genital itching: use it with Di Fu Zi (Fructus Kochiae) and Ku Shen Gen (Radix Sophorae Flavescentis) topically as a powder or wash.
• Eczema: combine it with Gang Zhu (Rhizoma Atractylodis), Huang Bai (Cortex Phellodendri), Bai Xian Pi (Cortex Dictamni) and Ku Shen Gen (Radix Sophorae Flavescentis).
Dermatological disorders: Bian Xu treats tinea, oozing sores and damp skin lesions. It can either be taken internally or applied topically.
3. Dispels Damp-Heat
Bian Xu treats jaundice caused by damp-heat.
• Jaundice: use it with Yin Chen Hao (Herba Artemisiae Scopariae) and Zhi Zi (Fructus Gardeniae).
DOSAGE
10 to 15 grams.
CAUTIONS / CONTRAINDICATIONS
• Over-consumption of Bian Xu may cause depletion of jing (essence) and qi.
CHEMICAL COMPOSITION
Avicularin, quercitrin, d-catechol, gallic acid, caffeic acid, oxalic acid, silicic acid, cholorogenic acid, p-coumaric acid. 1
PHARMACOLOGICAL EFFECTS
• Diuretic: Decoction of Bian Xu at 20 g/kg increased the excretion of water, sodium and potassium in rats. 2
• Antibiotic: Decoction of Bian Xu has an inhibitory influence on Bacillus dysenteriae, Staphylococcus aureus, and Pseudomonas aeruginosa?
• Antihypertensive: Intravenous injection of water or alcohol extracts of Bian Xu lowered blood pressure in dogs, rabbits, and cats. The antihypertensive effect is attributed to increased urine output. 4
CLINICAL STUDIES AND RESEARCH
• Acute bacterial dysentery: An herbal syrup of Bian Xu containing 1 g/ml of the herb was used to treat patients with acute bacterial dysentery; 50 ml of the syrup was administered two to three times daily. Out of 108 patients, there was complete recovery in 104 cases and moderate improvement in 4 cases. The average was one day for reduction of body temperature, four days for relief of abdominal pain, and five days for return of nor mal bowel movement. No adverse reaction was reported during the treatment period. In a follow-up evaluation of 36 patients between 1 and 12 months after treatment, there were only 2 cases of recurrence. 5
• Toothache: A decoction of 50 to 100 grams of Bian Xu given in two equally-divided doses effectively treated toothache. Of 81 patients, 80 reported relief of pain within 2 to 3 days after the treatment. 6
HERB-DRUG INTERACTION
• Diuretics: Bian Xu has a diuretic effect. Though this potential interaction has not been documented, concur rent use with diuretic drugs may lead to increased elimi nation of water and/or electrolytes. 7 [Note: Examples of diuretics include chlorothiazide, hydrochlorothiazide, furosemide (Lasix), bumetanide (Bumex), and torsemide (Demadex).]
TOXICOLOGY
Bian Xu may cause dermatitis or gastrointestinal distur bance when used as food for horses and sheep. 8
References
1. Xian Dai Zhong Yao Yao Li Xue (Contemporary Pharmacology of Chinese Herbs), 1997; 556
2. Chang Yong Zhong Yao Cheng Fen Yu Yao Li Shou Ce (A Handbook of the Composition and Pharmacology of Common Chinese Drugs), 1994; 1665:1667
3. Yi Xue Xue Bao (Report of Medicine), 1983; 18(9):700
4. Chang Yong Zhong Yao Cheng Fen Yu Yao Li Shou Ce (A Handbook of the Composition and Pharmacology of Common Chinese Drugs), 1994; 1665:1667
5. Zhong Cao Yao Tong Xun (Journal of Chinese Herbal Medicine), 1972; 2:24
6. Shan Xi Zhong Yi ( Shanxi Chinese Medicine), 1986; 1:28
7. Chen, J. Recognition & prevention of herb-drug interactions, Medical Acupuncture, Fall/Winter 1998/1999; volume 10/number 2; 9-13
8. Zhong Yao Yao Li Xue (Study of Chinese Herbology), 1986; 127
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