Dà Huáng (大黄) — Chinese Rhubarb Root

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Incompatibilities
7. Cautions
8. Treatment at my clinic

1. Overview

Dà Huáng (大黄) — the root and rhizome of Rheum palmatum or R. tanguticum — is the most important purgative herb in Chinese medicine. It belongs to the category of Downward-draining herbs. Beyond its purgative action it is also a powerful Blood mover and Heat clearer, making it useful in conditions far broader than constipation alone. Preparation method dramatically alters its action: raw Da Huang is a strong purgative; wine-fried it primarily moves Blood; charred it stops bleeding.

2. Properties

3. Actions and indications

Principal actions

1. Drains Heat and unblocks the bowels
2. Drains Fire and clears Heat-Toxin
3. Invigorates Blood and breaks Blood stasis
4. Clears Damp-Heat (jaundice, urinary problems)
5. Cools Blood and stops bleeding (when charred)

Indications

1. Constipation from Heat with abdominal fullness, dry stools, fever
2. Acute appendicitis, intestinal abscess (with Mu Dan Pi)
3. Blood stasis — dysmenorrhoea, amenorrhoea, traumatic injury
4. Damp-Heat jaundice
5. Heat-toxin sores, burns (topical)
6. Bleeding from Heat (haemoptysis, epistaxis, GI bleeding) when charred

4. Key formulas containing Dà Huáng

• Da Cheng Qi Tang — major purgative formula for Yangming Fu syndrome
• Xiao Cheng Qi Tang — minor purgative
• Tao He Cheng Qi Tang — Blood stasis in the lower jiao
• Ma Zi Ren Wan — mild moistening purgative
• Yin Chen Hao Tang — Damp-Heat jaundice

5. Modern research

Active constituents include anthraquinones (rhein, emodin, aloe-emodin, chrysophanol) responsible for its laxative action via stimulation of intestinal motility, and stilbenes with anti-inflammatory activity. Modern research demonstrates anti-bacterial, anti-viral, anti-inflammatory, hepatoprotective and renoprotective effects. Rhein in particular has been studied for chronic kidney disease, where it modulates fibrosis pathways.

6. Incompatibilities

Dà Huáng (大黄) Chinese Rhubarb Root is not listed in either of the two classical incompatibility texts — Shi Ba Fan (Eighteen Antagonisms) or Shi Jiu Wei (Nineteen Mutual Inhibitions). As with every Chinese herb it should be prescribed only as part of a balanced formula by a registered Chinese herbalist (RCHM), who will check for interactions with any other herbs and prescription medications you are taking.

7. Cautions

Contraindicated in pregnancy and breastfeeding. Contraindicated in Spleen and Stomach deficiency cold without Heat or stagnation. Use cautiously and short-term only; long-term use of stimulant laxatives causes dependence and electrolyte disturbance. Always consult a qualified Chinese herbalist registered with the RCHM.

Pattern contraindications

Contraindicated in pregnancy, lactation, Spleen and Stomach Qi/Yang deficiency, and dehydration. Short courses only — long-term use damages the digestion and depletes fluids.

Modern drug interactions

Long-term use depletes potassium and can precipitate digoxin toxicity, arrhythmias and worsening of hypokalaemia from loop or thiazide diuretics. Not for use beyond 1–2 weeks except under supervision. Contraindicated in pregnancy and lactation.

8. Treatment at my clinic

I prescribe Da Huang within tailored formulas for acute Heat constipation, Blood stasis disorders and as a small adjunct in chronic Damp-Heat formulas. I see patients at my clinic in Wokingham, Berkshire. Online consultations are available.

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