Materia Medica - Important
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Pharmaceutical Name
Herba Polygoni avicularis
Botanical Name
Polygonum aviculare L.
Common Name
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
Meridian
Urinary bladder
Functions
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.
Dosage
10-15 g
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