Radix Euphorbiae Pekinensis


The root of Euphorbia pekinensis Rupr., family Euphorbiaceae or Knoxia valerianoides Thorel et Pitard, family Rubiaceae

1. E. pekinensis: Root terete, with an enlarged root stock, 10-20 cm long and 2-4 cm in diameter. Superficial cork brown, obviously wrinkled, with fibrous roots or scars. Section yellow-white and fibrous.
2. K. valerianoides: Root somewhat fusiform, 3-10 cm long and 0.5-1.0 cm in diameter. Superficial cork brown-red to brown, twisted, wrinkled and coarse. Section yellow-white, sticky when wetted. Bitter in taste, cold in nature, toxic, and attributive to lung, kidney and large intestine channels.

1. purge and eliminate the retention of phlegm: For sthehiasyndrome with hydrothorax, ascites, edema and retention of phlegm, used together with Radix Euphorbiae Kansui and Flos Genkwa; for epilepsy attributive to retention of phlegm in the heart, used together with Euphorbiae Kansul and Semen Sinapis Albae.
2. Purge heat and relax the bowels: For sthenia-heat syndrome with constipation.
3. Relieve swelling and disperse the lumps: External use for skin nodules, scrofula and skin infection.

Pharmacological Action
1. Purgative. Its hot water extract is more potent than its ether extract.
2. Dilating the terminal blood vessels and antagonising the hypertensive effect of adrenaline.

Administration Decoction: 1.5-3.0g.
Powder: 1g 1-3 times daily.

Caution: This medicine may cause nausea and vomiting, and should be contraindicated for pregnant women, patients with cardiac failure and general debility.


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Mr. Wang Tao

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