Huang Lian
StarCoptis chinensis Franch.
☯ TCM Properties
Clears Heat and dries Dampness; Drains Fire; Resolves Toxicity; Clears Heart Fire; Cools the Blood and Stops Bleeding; Clears Stomach Heat
Traditional Chinese Uses
Shan Yao (Chinese yam, dioscorea rhizome) is a neutral, sweet herb that gently tonifies the Spleen, Lung, and Kidney — making it one of the most broadly applicable tonic herbs in Chinese medicine. It addresses Spleen deficiency with poor appetite, diarrhea, and fatigue; Lung deficiency with chronic cough; and Kidney deficiency with spermatorrhea, excessive vaginal discharge, and frequent urination. As both a food and medicine, it is one of the safest long-term tonics and is commonly incorporated into medicinal soups and congees.
Western Herbalism Properties
Used In Formulas (2)
Botanical Description
Coptis chinensis is a low-growing herbaceous perennial in the Ranunculaceae, endemic to central and southern China, where it inhabits cool, moist, shaded broadleaved and mixed forests at elevations of 500-2,000 m. Plants reach 15-25 cm tall and arise from a creeping, knotty, bright golden-yellow rhizome that branches sympodially, leaving distinct nodal scars. The basal leaves are long-petiolate and ternately compound, the central leaflet ovate with deeply incised, sharply serrate lobes and the lateral leaflets asymmetrically two-lobed; all are leathery and dark green with sunken veins. In early spring slender flowering scapes bear loose cymes of three to eight small, greenish-white to pale yellow flowers, each with five to six narrow petaloid sepals and shorter, club-shaped true petals. The fruits are stalked clusters of green follicles that split to release a few small black seeds. The rhizomes are lifted in autumn after several years of cultivation.
Active Constituents
Berberine
Isoquinoline (protoberberine) alkaloidConcentration: approx. 5-8% (pharmacopoeial marker, >=5.5% for Coptis chinensis)
The dominant active and quality marker. Broadly antimicrobial and antiprotozoal, anti-inflammatory, antidiarrhoeal, glucose- and lipid-lowering (via AMPK activation and improved insulin sensitivity), and bitter/cooling, accounting for most of Huang Lian's Heat-clearing and Damp-drying actions.
Coptisine
Protoberberine alkaloidConcentration: approx. 0.8-2%
Antimicrobial, anti-inflammatory and lipid-lowering; contributes with berberine to the antibacterial and gastrointestinal actions and is a co-marker of Coptis.
Palmatine
Protoberberine alkaloidConcentration: approx. 0.5-1.5%
Antimicrobial, anti-inflammatory and sedative; broadens the antibacterial spectrum of the crude drug.
Jatrorrhizine
Protoberberine alkaloidConcentration: approx. 0.3-1%
Antimicrobial, antioxidant and hypolipidaemic; contributes to the herb's cholesterol-lowering and antifungal activity.
Epiberberine
Protoberberine alkaloidConcentration: qualitative (minor, a pharmacopoeial identity marker)
Antimicrobial and enzyme-inhibitory (e.g. urease inhibition relevant to gastric activity); used together with berberine, coptisine and palmatine for HPLC identification of Coptis.
Magnoflorine
Aporphine alkaloidConcentration: qualitative (minor)
Mild hypotensive and antioxidant activity, complementing the protoberberine alkaloids.
⚠ Drug Interactions
Cyclosporine A
In renal-transplant recipients, berberine raised cyclosporine trough concentrations by roughly 25-90%, most likely by inhibiting hepatic and intestinal CYP3A4 and P-glycoprotein and slowing gastrointestinal transit.
Clinical note: Avoid concurrent use or monitor cyclosporine levels closely; the interaction is clinically significant.
CYP3A4 / CYP2D6 / CYP2C9 substrates
Repeated berberine dosing inhibits CYP3A4, CYP2D6 and CYP2C9 in humans, so drugs metabolised by these enzymes (e.g. midazolam, dextromethorphan, many statins) may reach higher concentrations.
Clinical note: Use caution and consider monitoring when combined with narrow-therapeutic-index CYP substrates.
Antidiabetic agents (metformin, sulfonylureas, insulin)
Berberine independently lowers fasting and postprandial glucose and HbA1c; combined with hypoglycaemic drugs the effect can be additive.
Clinical note: Monitor blood glucose; antidiabetic doses may need adjustment.
Bilirubin-displacing context (neonates, G6PD deficiency)
Berberine displaces bilirubin from serum albumin and can raise free bilirubin, which is hazardous in neonates with jaundice and in G6PD-deficient individuals.
Clinical note: Contraindicated in neonates and during pregnancy near term; use caution in G6PD deficiency.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 6-15g | Daily | — | — | — |
Preparation Methods
Raw / unprocessed (sheng huang lian)
Parts: rhizome
The dried rhizome used unprocessed. The raw form most strongly drains Fire and clears Heart and Stomach Heat and resolves toxicity, used for high fever, irritability, mouth sores and damp-heat dysentery. Typical decoction dose is small because of intense bitterness and cold: 2-5 g (up to 9 g).
Wine-fried (jiu huang lian)
Parts: rhizome
Slices are stir-fried with rice wine. Wine processing moderates the extreme cold and directs the action upward, making it suitable for clearing Heat of the upper burner such as red, painful eyes and mouth/tongue sores.
Ginger-fried (jiang huang lian)
Parts: rhizome
Slices are fried with fresh ginger juice. Ginger tempers the coldness and enhances the ability to clear Stomach Heat and stop vomiting, used for damp-heat nausea and epigastric focal distention.
Evodia-processed (yu huang lian)
Parts: rhizome
Coptis is processed together with a decoction of Wu Zhu Yu (Evodia). This softens the cold nature and adds a warming, Liver-coursing quality for Liver-Stomach disharmony with acid reflux and flank pain (the Zuo Jin Wan pairing).
Clinical Studies
The effect of berberine on metabolic profiles in type 2 diabetic patients: a systematic review and meta-analysis of randomized controlled trials
Pooling RCTs of berberine (the chief Coptis alkaloid) in type 2 diabetes, the review found significant reductions in fasting and postprandial blood glucose, HbA1c, triglycerides and total cholesterol versus control, supporting a genuine antidiabetic and lipid-lowering effect while noting variable trial quality.
Systematic review and meta-analysis of Coptis chinensis Franch.-containing traditional Chinese medicine as an adjunct therapy to metformin in the treatment of type 2 diabetes mellitus
Across 33 RCTs (2,846 patients), Coptis chinensis-containing prescriptions added to metformin improved fasting blood glucose, 2-hour postprandial glucose, HbA1c and insulin-resistance markers compared with metformin alone, indicating an adjunctive benefit though the authors flag heterogeneity and trial-quality limitations.
Historical Texts
Shennong Bencao Jing (Divine Husbandman's Classic of Materia Medica)
Han dynasty, c. 200 CEShanghan Lun (Treatise on Cold Damage), Zhang Zhongjing
Eastern Han, c. 200 CEBencao Gangmu (Compendium of Materia Medica), Li Shizhen
Ming dynasty, 1578 CEReferences
- Bensky D, Clavey S, Stoger E. Chinese Herbal Medicine: Materia Medica, 3rd edition . Eastland Press, Seattle (2004) [DOI]
- Chinese Pharmacopoeia Commission. Pharmacopoeia of the People's Republic of China, Volume I (Huanglian / Coptidis Rhizoma) . China Medical Science Press, Beijing (2020) [DOI]
- Guo J, Chen H, Zhang X, et al.. The effect of berberine on metabolic profiles in type 2 diabetic patients: a systematic review and meta-analysis of randomized controlled trials . Oxidative Medicine and Cellular Longevity (2021) [DOI]
- Ma H, et al.. Systematic review and meta-analysis of Coptis chinensis Franch.-containing traditional Chinese medicine as an adjunct therapy to metformin in the treatment of type 2 diabetes mellitus . Frontiers in Pharmacology (2022) [DOI]
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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