Knotweed herb (Polygoni avicularis herba)

Published April 23, 1987; Revised March 13, 1990.
List of German Commission E Monographs (Phytotherapy)


Name of Drug

Polygoni avicularis herba, knotweed, knotgrass.

Composition of Drug

Knotweed herb consists of the dried herb, occasionally containing roots, of Polygonum aviculare L. [Fam. Polygonaceae], gathered during flowering season, as well as its preparations in effective dosage.

The drug contains tannin and silicic acid.


Mild catarrhs of the respiratory tract, inflammatory changes to the oral and pharyngeal mucosa.


None known.

Side Effects

None known.

Interactions with Other Drugs

None known.


Daily dosage:

4 - 6 g of drug; equivalent preparations. Mode of Administration Ground herb for teas and other galenical preparations for internal use and local application.


Acetylcholinesterase inhibitor.