Dà Huáng · Rhubarb Root
Dà Huáng (大黄, Rhubarb Root) is a herb of Cold nature and Bitter flavor, in the “Heat Clearing” category. Tradition uses it to purge Accumulations, Clear Heat and Fire, Drain Blood Heat.
Energetic profile
- Pinyin name
- Dà Huáng
- Characters
- 大黄
- Botanical name
- Rheum palmatum L.
- Family
- Polygonaceae
- Part used
- Root and rhizome
- Nature
- Cold
- Flavor
- Bitter
- Meridians
- Heart, Large Intestine, Liver, Spleen, Stomach
- Category
- Heat Clearing
- Toxicity
- Slightly toxic
- Pregnancy
- Avoid
- Origin
- China (Gansu), China (Qinghai), China (Shaanxi)
Actions according to tradition
- Purge Accumulations
- Clear Heat and Fire
- Drain Blood Heat
- Invigorate Blood and Remove Stasis
Traditional uses
- Constipation from heat accumulation or blood stasis
- High fever with delirium and abdominal distension
- Blood heat causing nosebleed and vomiting blood
- Fire toxin skin eruptions and sores
- Jaundice from damp-heat
Studied effects and current applications
- Strongly purges intestinal accumulation and constipation
- Drains heat from stomach, intestines, and liver
- Stops bleeding by clearing blood heat
- Breaks blood stasis and reduces inflammation
- Anti-bacterial and promotes bile flow
Applications under investigation
- Acute constipation and bowel preparation
- Liver and gallbladder disease
- Gastrointestinal bleeding
- Burns and wound healing (topical)
- Pancreatitis and appendicitis
An effect being investigated does not mean it has been proven in humans.
Contraindications and adverse effects
Absolute contraindications
- Pregnancy
- Breastfeeding
- Intestinal obstruction
- Abdominal bleeding from deficiency cold
- Children under 12
Relative contraindications
- Chronic weakness and deficiency
- Pre-surgical period
- Pregnancy
- Absolutely contraindicated. Strong purgative causes miscarriage.
- Breastfeeding
- Passes into breast milk. Can cause diarrhea in infant.
- Children
- Avoid in children under 12. Very strong purgative action.
- Older adults
- Use very cautiously in elderly. Low doses only. Monitor for dehydration.
Possible adverse effects
- Severe diarrhea and cramping
- Dehydration and electrolyte imbalance
- Secondary constipation after prolonged use
- Possible carcinogenicity with long-term use
When to stop
- Immediately if pregnancy suspected
- Severe abdominal pain
- Blood in stool
- After maximum 5-7 days use
Interactions with medications
| Group | Drugs | Severity | Effect and recommendation |
|---|---|---|---|
| Laxatives | Senna, Bisacodyl, Lactulose | Severe | Severe additive laxative effect - risk of dangerous diarrhea and electrolyte imbalance Never combine |
| Diuretics | Furosemide, HCTZ | Moderate | Combined effect may cause severe electrolyte imbalance Avoid combination |
| Anticoagulants | Warfarin | Moderate | May affect vitamin K absorption; complex interaction Monitor INR |
| Digoxin | Digoxin | Severe | Electrolyte imbalance from diarrhea can increase digoxin toxicity Absolutely avoid combination |
| Diabetes medications | Insulin, Metformin | Mild | May affect glucose absorption Monitor blood glucose |
| Tetracycline antibiotics | Tetracycline, Doxycycline | Mild | May bind tetracycline in gut reducing absorption Take 2 hours apart |
With other herbs
- licorice Licorice moderates Da Huang's purgative action in formulas
Reference dose
- Decoction
- 3-12 grams daily
- Powder
- 0.5-2 grams daily (for gentle effect)
- Acute use
- 1-3 days maximum
- Chronic use
- NOT_RECOMMENDED_LONG_TERM
- Maximum
- Maximum 5-7 days then stop
- Children
- Strong purgative. Avoid in children under 12. If needed: 1-3g maximum under supervision.
Forms of preparation
Add last 5-10 min of cooking to preserve purging effect. 3-12g.
Acute constipation, full purgative effect
Simmer 30+ min to reduce purgative action. Focus on blood-clearing actions.
Blood stasis, clearing without strong purge
Make paste with water or honey. Apply to burns or sores.
Burns, wounds, skin infections
Approximate doses from the literature; they are not a prescription. Consult a professional.
Active compounds
Anthraquinones (emodin, rhein, aloe-emodin) and stilbenes
Anthraquinone · Laxative, anti-inflammatory, antitumor, antiviral
Colonic motility stimulation via cl- and water, NF-κB and STAT3 inhibition, topoisomerase inhibition · 0.2-1.5% in rhizome
Carboxylated anthraquinone · Laxative, nephroprotective, antidiabetic, joint anti-inflammatory
IL-1β, TNF-α and IL-6 inhibition in chondrocytes; NF-κB inhibition; diuresis · 0.5-2.5%
Anthraquinone alcohol · Antitumor, laxative, antimicrobial
Apoptosis induction in tumor cells (EGFR blockade), C. difficile inhibition · 0.3-1.0%
Stilbenes · Antioxidant, cardioprotective, antifungal
SIRT1 activation, free radical scavenging, inhibition of fungal ergosterol synthesis · 0.1-0.3%
Hydrolyzable tannins · Astringent, antibacterial, hemostatic
Bacterial protein precipitation, fibrinolytic coagulation inhibition · 5-15% (responsible for the biphasic effect: purging vs astringent)
Harvesting and processing
- Harvest
- Autumn (September-October), plants 3 or more years old
Rhizomes and roots harvested in autumn from plants 3 years or older. Rheum palmatum, R. tanguticum and R. officinale are the three medicinal species. Gansu and Qinghai are the main producers.
Rhizome cut into slices and dried without additional processing. Produces strong purgation. It is added at the end of the decoction (the last 5 minutes) for maximum purgative action.
Slices mixed with yellow wine (10 ml per 100 g) and fried over medium heat. Wine partially reduces purgative anthraquinones and directs the action upward.
Slices steamed with yellow wine for several hours and then dried. Repeated vaporization dramatically reduces free purgative anthraquinones.
Fried slices over high heat until superficial charring. Charring almost completely destroys the purgative action and enhances hemostasis.
Health notice. Educational and study content. It describes concepts of Traditional Chinese Medicine and does not replace diagnosis or treatment by a healthcare professional. Needling, medicinal herbs and invasive techniques must be applied by trained professionals. Safety guide.
