Ingredient Processed / Derived product (加工品 jiā gōng pǐn)

Dan Nan Xing

Bile Arisaema · 胆南星

Arisaema erubescens (Wall.) Schott, Arisaema heterophyllum Bl., or Arisaema amurense Maxim. · Arisaema Cum Bile

Also known as: Dan Xing (胆星)

Dan Nan Xing is a processed form of the herb Tian Nan Xing (Arisaema) combined with animal bile, which transforms its nature from warm and drying to cool and moistening. It specializes in clearing heat, dissolving thick yellow phlegm, and calming convulsions, making it a key remedy for cough with phlegm-heat, seizures, and stroke with phlegm obstruction.

Category Herbs that cool and transform Phlegm-Heat (清化热痰药) Wind-extinguishing and spasm-relieving herbs (息风止痉药)
Therapeutic focus Respiratory health Seizure disorders Stroke recovery Children's health

TCM Properties

Temperature

Cool

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels entered

Lungs, Liver, Spleen

Parts used

Processed / Derived product (加工品 jiā gōng pǐn)

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Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Ingredient Does

Every ingredient has a specific set of actions — here's what Dan Nan Xing does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Dan Nan Xing is primarily used to support these areas of health:

Respiratory health Seizure disorders Stroke recovery Children's health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Dan Nan Xing performs to restore balance in the body:

Clears heat and transforms phlegm (清热化痰) Extinguishes wind and stops convulsions (息风定惊)

How these actions work

Clears heat and transforms phlegm: Dan Nan Xing's cool nature makes it suitable for phlegm that is combined with heat — the kind that produces thick, yellow, sticky sputum and causes chest congestion. It breaks down this phlegm so the Lungs can expel it, while simultaneously cooling the underlying heat. This action is used for acute bronchitis, pneumonia, and other respiratory infections with hot phlegm.

Extinguishes wind and stops convulsions: The herb calms the Liver and internal wind that arises from phlegm-heat. In TCM, wind can stir internally and cause spasms, seizures, or stroke-like symptoms. Dan Nan Xing enters the Liver channel to settle this wind, particularly when it's fuelled by phlegm-heat. This makes it valuable for epilepsy, febrile convulsions in children, and stroke with convulsive signs.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Dan Nan Xing is used to help correct these specific patterns.

Why Dan Nan Xing addresses this pattern

Dan Nan Xing, with its cool nature and bitter, slightly acrid taste, enters the Lung channel to clear heat and transform phlegm, directly addressing the hot phlegm obstructing the Lungs. Unlike its parent herb Tian Nan Xing, which is warm and drying, the bile-processing gives it a cooling property that specifically targets phlegm-heat patterns without damaging Yin. It alleviates cough, chest tightness, and thick yellow sputum by dissolving the hot phlegm and guiding it downward.

A practitioner would look for one or more of these signs

Cough

Cough with thick yellow, sticky sputum

Yellow Sputum

Expectoration of yellow or green phlegm

Chest Tightness

Chest oppression and fullness

Dyspnea

Shortness of breath or wheezing

Commonly Used For

These are conditions where Dan Nan Xing is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Phlegm-Fire harassing the Heart Wind-Phlegm

TCM Interpretation

Epilepsy in TCM is often caused by phlegm turbidity combined with fire or wind. When phlegm-heat or wind-phlegm internally obstructs, it clouds the heart orifices and stirs up internal wind, leading to convulsive episodes. The root lies in the Spleen's inability to transform fluids, generating phlegm, which then combines with heat from emotional stress or other factors, ultimately rising to disturb the Shen (Spirit).

Why Dan Nan Xing Helps

Dan Nan Xing cools the heat, transforms the phlegm, and extinguishes wind. By entering the Liver and Spleen channels, it addresses both the wind and phlegm aspects. Its bile-processing adds a cooling hepatic-calming effect, making it particularly suited for heat-induced convulsive disorders. It can be used in combination with other herbs like Tian Zhu Huang and Zhu Li for synergistic effects.

Also commonly used for

Febrile Seizures

Stops convulsions in children with high fever

Acute Bronchitis

Clears heat and transforms thick yellow phlegm

Ingredient Properties

Every ingredient has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels Entered

Lungs Liver Spleen

Parts Used

Processed / Derived product (加工品 jiā gōng pǐn)

Dosage & Preparation

These are general dosage guidelines for Dan Nan Xing — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

3–6g

Maximum dosage

Do not exceed 6g per day in standard practice; higher doses may cause gastrointestinal irritation.

Dosage notes

Standard dose is 3–6g in decoction. For mild cases or children, use 1.5–3g. For acute febrile convulsions, the full 6g may be used short-term. Always use within a formula rather than as a single herb. The processed nature of Dan Nan Xing means it can be decocted together with other herbs without special handling.

Preparation

Dan Nan Xing is typically added directly to the decoction with other herbs; no special preparation is required. It is often used in pill or powder form as well.

Processing Methods

In TCM, the same ingredient can be prepared in different ways to change its effects — here's how processing alters what Dan Nan Xing does

Processing method

Raw Tian Nan Xing fine powder is mixed with fresh ox, pig, or sheep bile, allowed to ferment naturally (often through repeated cycles of sun-drying and night-dewing), then cut into small blocks and dried.

How it changes properties

Fermentation transforms the warm, drying, and toxic raw herb into a cool, moistening, and relatively non-toxic medicine. The bile's bitter-cold nature neutralizes the acrid, hot toxicity, while fermentation breaks down irritant compounds. The resulting herb is bitter, slightly acrid, and cool; it enters the Lung, Liver, and Spleen channels and specializes in clearing heat-phlegm and extinguishing wind to arrest convulsions.

When to use this form

Preferred for acute febrile convulsions, epilepsy with heat signs, and cough with thick yellow sputum where strong heat-clearing and wind-calming is needed.

Common Ingredient Pairs

These ingredients are traditionally combined with Dan Nan Xing for enhanced therapeutic effect

Tian Zhu Huang
Tian Zhu Huang 1:1 (e.g., Dan Nan Xing 3g, Tian Zhu Huang 3g)

Together they powerfully clear heat, resolve phlegm, and calm wind, especially for children with convulsions due to phlegm-heat.

When to use: When there is high fever, convulsions, seizures, or restlessness with thick yellow phlegm — common in pediatric febrile convulsions or epilepsy.

Zh
Zhu Li Dan Nan Xing 3-6g, Zhu Li 30-60ml (fresh juice)

Zhu Li moistens and guides phlegm out, while Dan Nan Xing clears heat and extinguishes wind; the pair is very effective for phlegm-heat obstructing the chest and causing stroke or severe dyspnea.

When to use: In stroke with phlegm-qi obstruction, loss of consciousness, and rattling phlegm in the throat; also for acute bronchitis with difficult expectoration.

Shi Chang Pu
Shi Chang Pu 1:1 (e.g., Dan Nan Xing 5g, Shi Chang Pu 5g)

Shi Chang Pu opens the orifices and transforms turbid phlegm; combined with Dan Nan Xing's heat-clearing and wind-extinguishing, it treats phlegm misting the heart and orifices.

When to use: For stroke with aphasia, mental confusion, and phlegm-heat signs; also in epilepsy with impaired consciousness.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Tian Zhu Huang
Dan Nan Xing vs Tian Zhu Huang

Both clear heat, resolve phlegm, and calm wind for seizures, but Tian Zhu Huang is milder, sweet and cool, focusing on Heart heat and spirit disturbances, while Dan Nan Xing is bitter and cool with a stronger wind-extinguishing action and is better for phlegm-heat induced convulsions where wind is prominent.

Identity & Adulterants

Related species and common adulterations to be aware of when sourcing Dan Nan Xing

Dan Nan Xing is sometimes confused with improperly processed Tian Nan Xing or with other bile-processed herbs. Adulteration may involve using insufficient bile or substituting cheaper animal biles. Authentic Dan Nan Xing should be hard, dark, and bitter with a distinct bile odor. Products that are pale, soft, or lack bitterness may be of inferior quality or adulterated.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any ingredient.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Dan Nan Xing

Slightly toxic

The raw Tian Nan Xing contains calcium oxalate raphides (needle-like crystals) and possibly toxic proteins that cause intense irritation, numbness, and swelling of mucous membranes. Ingestion of the raw herb can cause oral and throat burning, hypersalivation, vomiting, and in severe cases, respiratory distress. Processing with bile (ox, pig, or sheep) significantly reduces this toxicity: bile acids partially dissolve or complex the raphides, and the fermentation or steaming process alters the toxic proteins. The resulting Dan Nan Xing is much safer, but overdose may still cause gastrointestinal discomfort. Never use the raw, unprocessed Tian Nan Xing internally.

Contraindications

Situations where Dan Nan Xing should not be used or requires extra caution

Avoid

Cold or weak Spleen and Stomach patterns (脾胃虚寒) — the herb's cool nature may aggravate digestive weakness, causing diarrhea or abdominal pain.

Caution

Pregnancy — the herb's phlegm-resolving and wind-extinguishing actions may disturb the fetus; use only under strict practitioner guidance.

Caution

Breastfeeding — insufficient safety data; avoid use or use only under practitioner supervision.

Caution

Children with weak constitution — dosage must be carefully adjusted; avoid prolonged use.

Avoid

Known allergy to Arisaema species or bile products.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution. Dan Nan Xing's phlegm-resolving and wind-extinguishing actions, though milder than raw Tian Nan Xing, may still stimulate uterine contractions or disturb the fetus. It should be used only when clearly indicated and under the supervision of an experienced practitioner, at minimal effective dosage.

Breastfeeding

Safety during breastfeeding has not been established. Due to the potential for active bile acid components and residual toxicity from the raw herb to pass into breast milk, use is not recommended unless essential and prescribed by a qualified practitioner. Monitor the infant for any signs of gastrointestinal upset.

Children

Dan Nan Xing is frequently used in children for febrile convulsions and cough with yellow sputum. The standard pediatric dose is 3–6g per day, adjusted according to age and weight. For infants and young children, start at the lower end (1.5–3g) and divide into 2–3 doses. Do not exceed 6g daily without practitioner supervision. Monitor for digestive upset.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Dan Nan Xing

No well-documented drug interactions are reported. Theoretically, its mild antiplatelet effects (from bile acids and flavonoids) could potentiate anticoagulants like warfarin, but clinical evidence is lacking. The herb may enhance the sedative effects of CNS depressants. Monitor if used concurrently with antiepileptic drugs.

Dietary Advice

Foods and dietary considerations when taking Dan Nan Xing

Avoid cold, raw, and greasy foods while taking Dan Nan Xing, especially in patients with Spleen deficiency or phlegm-dampness. Spicy, heating foods may counteract its cooling effect in heat-phlegm conditions.

Botanical Description

Physical characteristics and morphology of the Dan Nan Xing source source material

Dan Nan Xing is a processed medicinal, not a raw plant. Its source material is the dried tuber of several Arisaema species (Araceae): Arisaema erubescens (Wall.) Schott, Arisaema heterophyllum Bl., or Arisaema amurense Maxim. These are perennial herbs with a distinctive inflorescence consisting of a fleshy spike (spadix) surrounded by a leaf-like bract (spathe), often mottled in purple or green. The compound leaves are palmately divided with 5–17 leaflets. The plant grows in forests, thickets, and grasslands up to 2700 m elevation, widely distributed across China except the far northwest and Tibet. The tuber is harvested and then processed with animal bile to produce Dan Nan Xing.

Sourcing & Harvesting

Where Dan Nan Xing is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

The source tubers (Tian Nan Xing) are harvested in autumn and winter, when the aerial parts have died back.

Primary growing regions

The source plant Tian Nan Xing is widely distributed across most of China, especially in provinces south of the Yangtze River, including Sichuan, Yunnan, Guizhou, Hubei, Hunan, Jiangxi, and Anhui. No single 道地药材 region is designated for Dan Nan Xing itself, as it is a processed product manufactured in many regions.

Quality indicators

Good quality Dan Nan Xing is in the form of hard, block-like or cylindrical pieces with a dark brown to black-brown surface. It has a slightly fishy odor and a bitter taste. The texture should be firm and not easily crumbled. Avoid pieces that are soft, pale, moldy, or lack the characteristic bitter taste.

Classical Texts

Key passages from the classical Chinese medical texts that describe Dan Nan Xing and its therapeutic uses

  • 《本草汇言》(Ben Cao Hui Yan): “天南星，前人以牛胆制之，名曰胆星。牛胆苦寒而润，有益肝镇惊之功，制星之燥而使不毒。” — "Tian Nan Xing, when processed with ox bile by earlier practitioners, is called Dan Xing. Ox bile is bitter, cold, and moistening; it benefits the Liver and settles fright, moderates the dryness of the herb and renders it non-toxic."
  • 《本草纲目》(Ben Cao Gang Mu): 李时珍云：“得牛胆则不燥，得火炮则不毒。” — Li Shizhen said: "When treated with ox bile it loses its dryness; when processed by fire it loses its toxicity."
  • 《开宝本草》(Kai Bao Ben Cao): 记载以牛胆制天南星，可除其燥毒，使药性更温和。 — Records that processing Tian Nan Xing with ox bile eliminates its harshness and toxicity, making its nature milder.

Historical Context

The history and evolution of Dan Nan Xing's use in Chinese medicine over the centuries

Dan Nan Xing first appeared in the Northern Song dynasty's Kai Bao Ben Cao (开宝本草). The processing of Tian Nan Xing with bile represented a major innovation: it transformed a warm, drying, toxic herb into a cool, moistening, and relatively safe medicine specifically suited for heat-phlegm and convulsive disorders. The name 胆南星 literally means "bile-processed Nan Xing." Li Shizhen in the Ben Cao Gang Mu praised the method, noting that bile removed the herb's dryness while preserving its phlegm-resolving power. Over the centuries, the processing became more refined, with both fermentation and steaming methods developed. In modern clinical practice, Dan Nan Xing is a key herb in pediatric febrile convulsions and epilepsy formulas, often paired with Tian Zhu Huang, Niu Huang, and other wind-calming substances.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Dan Nan Xing

1

Effect of Arisaema Cum Bile on Brain Tissue Injury and Inflammation in Febrile Seizures Model Mice (2022)

Zeng P, Yan YM, Yu HL, et al. J Nanjing Univ Tradit Chin Med. 2022;38(6):520-526.

In a mouse model of febrile seizures, high-dose Dan Nan Xing water extract prolonged seizure latency, shortened seizure duration, reduced rectal temperature, upregulated GABA-A receptor expression, and decreased serum cAMP and PGE2 levels. It also downregulated COX-2, iNOS, and GFAP in brain tissue and reduced hippocampal IL-1β, IL-6, and TNF-α mRNA, indicating anti-inflammatory and neuroprotective effects.

DOI
2

Network Pharmacology and Electrophysiological Study of Arisaema Cum Bile on Epilepsy (2022)

Chen SR, Zhao JJ, Kong DZ, Zhang W. Acta Pharmaceutica Sinica. 2022;57(4):1031-1043.

Network pharmacology identified chenodeoxycholic acid, deoxycholic acid, and β-sitosterol as key active compounds, targeting GABA-A and serotonin receptors. Brain slice electrophysiology confirmed that β-sitosterol and chenodeoxycholic acid inhibited action potentials in mouse hippocampal CA1 pyramidal neurons, supporting anticonvulsant mechanisms.

DOI
3

Review: Chemical Constituents, Pharmacological Effects, and Clinical Applications of Arisaema Cum Bile (2020)

Tang ZQ, Li B, Wang QH, Kuang HX. China Pharmacy. 2020;31(12):1523-1527.

This review summarizes that Dan Nan Xing contains bile acids, flavonoids, nucleotides, and phenolics. Pharmacological actions include antipyretic, anti-inflammatory, analgesic, anticonvulsant, and antioxidant effects. Clinically, it is used in compound formulas for epilepsy, ischemic stroke, and cancer pain.

DOI

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.