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The dried aerial parts of Polygonum aviculare (Polygonaceae). Enters the Bladder channel. Bitter and downward-draining, it disinhibits urination and frees strangury while also killing parasites and relieving itching. Often paired with qu mai for heat strangury.
Reference range for non-pregnant adults. Not a personalized prescription. Pregnancy, lactation, and pediatric use require specialist supervision.
Protective guidance only — when to avoid or use with caution. This block deliberately omits pregnancy, lactation, and pediatric dosing: any such use must be managed by a qualified TCM practitioner or appropriate specialist.
味苦，平。主浸淫，疥瘙，疽痔，杀三虫。
下品
@misc{bencaodian-bian-xu,
author = {{Bencaodian Editorial}},
title = {Biǎn Xù 萹蓄 (Knotgrass) — Polygoni Avicularis Herba},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/bian-xu},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
萹蓄富含黄酮苷、鞣质和硅酸，具利尿、抗菌、止血、降血压和止痒作用。
Bian Xu is rich in flavonoid glycosides, tannins, and silica with diuretic, antibacterial, hemostatic, hypotensive, and antipruritic effects.
萹蓄苦微寒，利尿通淋，杀虫止痒。
Bitter-slightly cold; promotes urination, kills parasites, and relieves itch.
This section is provided for academic reference only and does not constitute medical advice.