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Bian Xu (Knotweed, Polygonum)

Previous Herb in CategoryNext Herb in Category Herb 4 of 28 in Herbs that Regulate Water and Drain Dampness

Slightly Cold Bian Xu (Herba Polygoni Avicularis)
Bitter, Slightly Cold
Herba Polygoni Avicularis
Tone Marks:
biăn xù
Alt Names:
Bian Xu Cao


  • Promotes Urination (Diuretic) and Dispels Damp Heat in the Bladder
    For burning and painful urination (Re Ling)
  • Kills Intestinal Parasites and Stops Itching
    For Roundworms, Pinworms, Hookworms, Ringworms, and Tapeworms.
    Also for tinea, eczema, and itching due to damp skin lesions, and for oozing sores. Bian Xu can be applied topically for this purpose.

Contraindications and Cautions

  • Overdose of Bian Xu can damage Jing and Qi

Herb-Drug Interactions

  • This section is being researched, and is not completed.

Toxicity and Overdose

  • This section is being researched, and is not completed.


  • 10-15 grams

This Herb Appears in the Following Formulas:

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