Long Dan Cao - Gentian root
Long Dan Cao—the root of the Chinese gentian (Gentiana scabra)—bears the striking name „dragon’s gall herb,“ which refers to its extremely bitter taste. It is the primary herb in the famous formula Lóng Dǎn Xiè Gān Tāng — the „Gentian Decoction for Draining the Liver“ — and the most potent remedy in TCM for clearing liver fire and damp-heat in the lower burner. Its bitter, cold nature subdues rising liver yang and extinguishes fire that manifests as headaches, red eyes, irritability, and ringing in the ears. At the same time, it dries up damp-heat in the urogenital region.
Effect from a Western perspective
- Gentiana scabra contains secoiridoid glycosides (gentiopicroside, swertiamarin), xanthones, and amarogentin—one of the most bitter naturally occurring substances.
- Studies show hepatoprotective, cholagogue, and anti-inflammatory effects.
- Gentiopicroside stimulates bile secretion and protects the liver from toxic damage.
- Antimicrobial activity against various bacteria and fungi has been demonstrated in vitro—which supports its use in cases of moisture and heat in the urogenital tract.
Effect from a TCM perspective
- Long Dan Cao clears damp-heat from the liver and gallbladder and extinguishes liver fire.
- It is the treatment of choice for rising liver fire accompanied by headaches, red and painful eyes, tinnitus, hearing loss, irritability, and a bitter taste in the mouth.
- In cases of damp-heat in the lower burner—leukorrhea, itching in the genital area, cloudy and painful urine, swollen and painful testicles—it penetrates the pathogenic factors and expels them.
- Long Dan Cao is also used to treat jaundice caused by damp-heat in the liver and gallbladder.
- Its strong, downward-directing nature—typical of bitter, cold herbs—makes it one of the most effective drainage agents in the entire TCM materia medica.
Application & dosage
- In a decoction, 3–6 g — low doses are sufficient due to its strong bitterness and cooling properties. An overdose causes nausea.
- Vomiting and loss of appetite. As a granule extract (5:1), typically 0
- 6–1
- 2 g. In pill form for long-term use in cases of chronic damp-heat.
Dosage forms
- Decoction
- Granules
- Tablets
- Pills
Dosage
3-6 g (decoction)
Frequent combination partners
Long Dan Cao often only develops its full effect in combination with other herbs
Combinations & formulas
- With Huáng Qín, Zhī Zǐ and Chái Hú in Lóng Dǎn Xiè Gān Tāng for liver fire and damp-heat.
- With Jú Huā and Xià Kū Cǎo for headaches caused by rising liver yang.
- With Huáng Bǎi and Cāng Zhú when there is moisture and heat in the lower heater.
- With Chē Qián Zǐ and Zé Xiè to eliminate moisture and heat through urine.
History & Tradition
Long Dan Cao — „Dragon’s Gall Herb“ — has been an integral part of Chinese medicine for over 2,000 years. As early as the *Shennong Ben Cao Jing* (Divine Farmer’s Classic of Materia Medica), the oldest Chinese herbal text from the Han Dynasty (ca. 200 B.C.), it is listed as a medium-class remedy and praised for its ability to clear heat from the viscera and expel damp-heat.
The name „Long Dan“—literally „dragon bile“—refers to the root’s extraordinarily bitter taste. In Chinese mythology, dragon bile is considered the bitterest substance of all. Li Shizhen, the great encyclopedist of the Ming Dynasty (1518–1593), devoted a detailed entry to Long Dan Cao in his magnum opus *Ben Cao Gang Mu* and highlighted its efficacy in treating liver fire, convulsions, and febrile illnesses. He particularly stressed the need to use the herb with caution and not for too long due to its extreme cold nature.
The classic formula Lóng Dǎn Xiè Gān Tāng — the „Gentian Decoction for Draining the Liver“ — originates from the work *Yi Fang Ji Jie* (1682) by the Qing Dynasty physician Wang Ang. To this day, this formula is considered one of the most important TCM formulations for treating liver fire and damp-heat in the lower burner, and it is used in modern clinical practice worldwide. Long Dan Cao is the key herb in this formula—its bitter, cold nature drains fire downward and expels damp-heat through the large intestine and bladder.
In Japan—where the plant is known as „Rindō“ (竜胆)—it has been used medicinally since the Nara period (710–794) and continues to adorn family crests to this day. In Japanese culture, the gentian flower is considered a symbol of sincerity and inner strength—qualities that are also attributed to the herb in a therapeutic context: the clear, uncompromising extinguishing of fire without detours.
Contraindications & caution
Strictly contraindicated for spleen and stomach cold, diarrhea caused by yang deficiency and loss of appetite without heat signs. The extreme bitterness and coldness can severely impair digestion. Do not use long-term in high doses - can permanently damage the spleen yang. Not for yin deficiency without damp-heat. Only use during pregnancy after careful consideration.
Botany
Gentiana scabra is a perennial plant in the gentian family (Gentianaceae) that grows to a height of 30–60 cm. The upright stems bear opposite, lanceolate leaves with a rough surface—hence the species name „scabra“ (Latin for “rough”). The funnel-shaped, deep blue-violet flowers appear in late summer and fall. The robust, yellowish-brown roots and rhizomes are used medicinally; when dried, they develop a characteristically intense, bitter odor.
The genus Gentiana includes over 400 species worldwide; in addition to Gentiana scabra, the closely related species Gentiana triflora and Gentiana manshurica are also used in TCM and are recognized as equivalent in the Pharmacopoeia of the People's Republic of China. The active ingredient gentiopicroside - responsible for the extreme bitterness - is found in comparable concentrations in all three species. The roots are harvested in the fall, when the active ingredient content is at its highest, and then dried and cut or processed into granules.
Occurrence
Gentiana scabra is native to East Asia and grows wild in the mountainous regions of China (Manchuria, Sichuan, Yunnan), Japan and Korea. The plant prefers moist, semi-shady locations on acidic, well-drained soil at altitudes of 200-2000 meters. In China, a large part of the supply today comes from cultivated crops, especially in the provinces of Heilongjiang, Jilin and Liaoning. Wild collection has declined due to overexploitation, which is why commercial cultivation is becoming increasingly important.
Related herbs
Herbs with similar effects and related areas of application
Comparable western herbs
- Yellow gentian (Gentiana lutea): Its European relative shares the extremely bitter taste due to gentiopicroside and is used in Western herbal medicine as a bitter tonic for digestive weakness and loss of appetite. It has a less “cold” effect than Long Dan Cao, but is closely related to it botanically and phytochemically.
- Milk thistle (Silybum marianum): How Long Dan Cao exerts its hepatoprotective effect—silymarin protects liver cells from toxic damage and promotes their regeneration. In Western phytotherapy, it is the most important liver protectant, though it lacks the pronounced heat-clearing and cholagogue properties of Chinese gentian.
- Greater celandine (Chelidonium majus): Cholagogue and bile-flow-promoting, like Long Dan Cao, with anti-inflammatory and antimicrobial effects. Used in European tradition for gallbladder inflammation and jaundice—comparable to the indications for Long Dan Cao in cases of damp-heat in the liver and gallbladder.
- Goldenrod (Solidago virgaurea): Used for infections and inflammation in the urogenital tract—an indication that corresponds to that of Long Dan Cao for damp-heat in the lower burner. It has diuretic, antimicrobial, and anti-inflammatory effects, but without the strong bitterness and effects on the liver associated with gentian.