Rhizoma Polygoni Cuspidati


Rhizome and root of Polygonum cuspidatum Sieb. et Zucc., family Polygonaceae.

Rhizome terete with enlarged nodes, several thick roots growing from the lower part, surface brown-yellow to brown-red. Cross section showing thin cortex and broad, radial and fibrous xylem, with the same colour as its surface. The pith of the rhizome usually hollowed. Slightly bitter in taste, slightly cold in nature, and attributive to liver, lung and gallbladder channels.

1. Clear away heat and dampness: For jaundice of dampness-heat type, recently used for cases of infectious hepatitis, icterus neonatorum, cholelithiasis and cholecystitis with dampness-heat or severe heat syndrome; for leucorrhagia and pruritus vulvae of dampness-heat type, including mycotic trichomonas and bacterial vaginitis (local use chiefly); for stranguria of heat type.
2. Clear away heat and toxic material: For burn; carbunculosis, snake bite, high fever with extreme thirst, and constipation.
3. Eliminate sputum and relieve cough: For cough of lung-heat type and chronic cough, usually used together with Folium Mahoniae and Folium Eno botryae.
4. Promote blood circulation and remove blood stasis: For amenorrhea, menorrhalgia and trauma with blood stasis, and rheumatism. Recently, also used for hyperlipemia and leukocytopenia.

Pharmacological Action
1. An active component, polydatin, decreases the level of blood-fat.
2. Raising the level of white blood cells.
3. Inhibiting the growth of various gram-positive and gram negative bacteria, Candida albicans, herpes virus, ECHO11 virus, and encephalitis B virus in vitro.
4. Polydatin can dilate blood capiliaries, improve micro-circulation and inhibit thrombosis.
5. Sedative and analgesic.

Administration Decoction: 10-30g.
Extemal use: 50% decoction for burn; cotton ball soaked in 100% decoction as vaginal suppository once daily for vaginitis; ointment for infection of soft tissue.


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