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Herba Polygoni avicularis
Polygonum aviculare L.
Polygonum, Common knotgrass
Source of Earliest Record
Shennong Bencao Jing
Part Used & Method for Pharmaceutical Preparations
The aerial parts of the plant are gathered in summer and dried in the sun.
Properties & Taste
Bitter and slightly cold
1. To promote water metabolism and regulate abnormal urination; 2. To expel parasites and stop itching
Indications & Combinations
1. Damp-heat in the urinary bladder manifested as scanty urine with blood, painful urination, urgency of micturition and frequent urination. Common knotgrass (Bianxu) is used with Pink (Qumai), Clematis stem (Mutong) and Talc (Huashi) in the formula Bazhen San.
2. Eczema and trichomonas vaginalis. The decoction of Common knotgrass (Bianxu) is used externally for washing.
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