Hong Da Ji
StarKnoxia valerianoides Thorel ex Pit.
Synonyms: Knoxia corymbosa auct. non Willd.
☯ TCM Properties
Drains water downward and drives out thin mucus; Reduces swelling and dissipates nodules
Traditional Chinese Uses
Hong Da Ji is the root of Knoxia valerianoides (Rubiaceae), a harsh downward-draining medicinal distinct from the Euphorbia-derived Jing Da Ji. Bitter, pungent and cold (and toxic), it drives pathogenic water and thin mucus (phlegm-fluid) downward through the stool and urine, and reduces swelling and dissipates nodules. Classically it is reserved for severe fluid accumulation patterns: pleural and abdominal water retention, generalized edema, and constipation with fullness in robust patients; it also treats scrofula, phlegm nodules, and toxic sores (often applied topically).
Because it is toxic and forcefully cathartic, dosing is small (roughly 1.5-3 g) and it is used only briefly in strong constitutions. It is contraindicated in pregnancy and in Qi, Blood, Yin or Yang deficiency, and classically antagonizes Gan Cao (licorice). Modern practice favors safer diuretics for most edema.
Western Herbalism Properties
Botanical Description
Knoxia valerianoides (Rubiaceae) is the source of Hong Da Ji, Radix Knoxiae. It is an erect perennial herb 30-70 cm tall arising from a cluster of fleshy, spindle- to tooth-shaped roots that are reddish-brown externally and red-brown in cross-section. Stems are quadrangular and pubescent, bearing opposite, lanceolate to narrowly elliptic leaves 5-10 cm long with entire margins and interpetiolar stipules. Small purple to violet flowers are crowded in dense terminal cymose heads that elongate in fruit, followed by tiny didymous capsules. The curved, tooth-like root, dug in autumn, is the drug: markedly toxic, it drains water downward, reduces swelling and dissipates nodules, and is usually processed with vinegar to temper its harshness.
Grassy hillsides, sunny slopes and open thickets in subtropical to tropical southern China.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-15g | Daily | — | — | — |
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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