Prepared rehmannia root (Shudihuang)
Rehmannia gultinosa (Gaertn.) Libosch. (Fam. Scrophulariaceae)
Pharmaceutical Name: Radix Rehmanniae
praeparata
Botanical Name: Rehmannia
gultinosa (Gaertn.) Libosch. (Fam. Scrophulariaceae)
Common Name: Prepared rehmannia root
Source of Earliest Record: Bencao
Tujing.
Part Used & Method for Pharmaceutical Preparations:
Dried
root.
This
herb is the dried root of Rehmannia glutinosa (Gaertn.) Libosch. The
dried root is mixed with yellow rice or millet wine, Pericarpium Citri
Reticulatae (Chen Pi), and Amomi Fructus (Sha Ren), and then
alternately steamed and dried in the sun until it turns black inside and
outside with a soft, sticky, and oily texture. Then it is sliced for
use.
Properties & Taste: Sweet and
slightly warm.
Meridians: Liver and kidney.
Functions:
To nourish blood and replenish yin.
Indications & Combinations:
1. Deficient blood syndrome manifested as
sallow complexion, dizziness, vertigo, palpitations, insomnia, irregular
menstruation and uterine bleeding. Prepared rehmannia root (Shudihuang) is
used with Chinese angelica root (Danggui) and White peony root (Baishao) in the
formula Siwu Tang.
2. Deficient kidney syndrome manifested as
afternoon fever, night sweating, noctural emissions, diabetes, dizziness and
blurred vision. Prepared rehmannia root (Shudihuang) is used with Dogwood
fruit (Shanzhuyu) and Dioscorea (Shanyao) in the formula Liuwei Dihuang Wan.
3. Deficient yin and excessive fire syndrome
manifested as afternoon fever, feverish sensation on the palms, soles and in
the chest, night sweating, noctural emissions, red tongue proper with scanty
coating and thready, rolling and rapid pulse. Prepared rehmannia root
(Shudihuang) is used with Tortoise plastron (Guiban), Anemarrhena rhizome
(Zhimu) and Phellodendron bark (Huangbai) in the formula Zhi Bai Dihuang Wan.
Dosage: 10-30 g, decocted in water for
internal use. It is used with herbs that strengthen the Spleen and Stomach,
such as Amomi Fructus (Sha Ren) and Pericarpium Citri Reticulatae (Chen Pi).
Cautions & Contraindications: Contraindicated
in patients with copious sputum due to Qi Stagnation, gastric and abdominal
distension, poor appetite, and loose stools.
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