Herb

Shan Dou Gen

Bushy Sophora root | 山豆根

Also known as:

Vietnamese sophora root , Pigeon-Pea Root , Sophora root

Shan Dou Gen

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Properties

Heat-clearing herbs · Cold

Traditionally supports*

Throat Health Oral and Dental Health Immune Support Respiratory Health

Parts Used

Root (根 gēn)

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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$56.00 ($0.56/g)
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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Shan Dou Gen is a powerful throat remedy in Chinese medicine, prized for its ability to clear intense Heat and reduce swelling in the throat. It is most commonly used for severe sore throats, swollen tonsils, and inflamed gums caused by excess Heat. Because it is classified as toxic, it must be used in small doses (3 to 6 grams) and only under the guidance of a qualified practitioner.

Herb Category

Heat-clearing herbs Herbs that clear Heat and resolve Toxicity (清热解毒药)

Main Actions

  • Clears Heat and Resolves Toxicity
  • Benefits the Throat and Reduces Swelling
  • Clears Lung Heat
  • Clears Stomach Heat

How These Actions Work

'Clears Heat and resolves toxins' means Shān Dòu Gēn has a powerful ability to purge intense Heat and toxic pathogenic factors from the body. In TCM, when Heat concentrates into a toxic form (called 'Fire toxin'), it can cause severe inflammation, swelling, and pain, particularly in the throat. Because Shān Dòu Gēn is intensely bitter and Cold in nature, it can directly counteract this Fire toxin. Classical texts describe it as 'a supreme medicine for clearing Heat and resolving toxins.' It is especially used for acute, severe conditions with obvious signs of Heat such as redness, swelling, and pain.

'Reduces swelling and benefits the throat' is the most celebrated action of this herb. Shān Dòu Gēn enters the Lung channel, and the throat is considered the gateway of the Lungs. When Fire toxin accumulates in the throat, it causes swelling, redness, and severe pain, making it difficult to swallow. Shān Dòu Gēn directly targets this area, clearing the Fire and reducing swelling. Classical physicians regarded it as the foremost herb (要药) for treating sore, swollen throats caused by Heat. It can even be used alone, held in the mouth and gargled, for mild cases.

'Clears Lung fire' refers to the herb's ability to purge excess Heat from the Lung system, addressing symptoms like cough from Lung Heat. 'Clears Stomach fire' reflects its entry into the Stomach channel: when Stomach fire flares upward, it causes gum swelling, toothache, and mouth ulcers, all of which Shān Dòu Gēn can address.

Important safety note: Shān Dòu Gēn is classified as toxic in the Chinese Pharmacopoeia. The standard dose is only 3 to 6 grams. Overdose can cause nausea, vomiting, and in serious cases, neurological or cardiovascular toxicity. It should only be used under professional guidance.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Shan Dou Gen is traditionally associated with these specific patterns.

The following describes this herb's classification within Traditional Chinese Medicine theory and is provided for educational purposes only.

Why Shan Dou Gen addresses this pattern

Fire toxin (火毒) is an intense form of pathogenic Heat that causes acute, red, swollen, painful conditions. When Fire toxin accumulates in the upper body, particularly the throat, it leads to severe sore throat, swollen tonsils (called 'rǔ é' or 'throat moth' in TCM), and difficulty swallowing. Shān Dòu Gēn is intensely bitter and Cold, giving it strong Heat-clearing and toxin-resolving power. It enters the Lung channel, allowing it to target the throat directly, which is considered the Lung's gateway. Classical sources call it the 'essential herb' (要药) for treating throat swelling from Fire toxin. Its bitter taste drives the action downward, draining Heat away from the inflamed area.

A practitioner would look for one or more of these signs

Sore Throat

Severe sore throat with redness and swelling

Tonsillitis

Swollen, inflamed tonsils (throat moth / rǔ é)

Gingivitis

Red, swollen, painful gums

Mouth Ulcers

Mouth sores from Heat toxin

TCM Properties

Temperature

Cold

Taste

Bitter (苦 kǔ)

Channels Entered
Lungs Stomach
Parts Used

Root (根 gēn)

This is partial information on the herb's TCM properties. More detailed information is available on the herb's dedicated page

Product Details

Manufacturing, supplier, and product specifications

Product Type

Granules

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Botanical & Sourcing

Quality Indicators

Good quality Shan Dou Gen root and rhizome should be firm, hard, and difficult to break. The rhizome portion is irregularly nodular with remnant stem bases on top and several roots extending below. The roots are long and cylindrical, sometimes branched, 0.7-1.5cm in diameter. The surface should be brown to dark brown with irregular longitudinal wrinkles and transverse lenticel-like protuberances. The cross-section should show a light brown bark (cortex) and pale yellow wood (xylem). It should have a characteristic bean-like (leguminous) odor, and the taste should be intensely bitter. Avoid material that is too thin, soft, moldy, or lacking the characteristic bitterness, as this may indicate an adulterant or poor quality.

Primary Growing Regions

The best quality Shan Dou Gen (道地药材) comes from Guangxi Province, particularly the Baise (百色) region including Tianyang, Lingle, Daxin, and Longjin counties. Yunnan Province (Wenshan area) and Guizhou Province (Xingren county) are also important producing regions. The herb is also distributed in Guangdong and Jiangxi. Classical sources (《本草品汇精要》) considered material from Yizhou, Guozhou, Zhongzhou, and Wanzhou to be of the highest quality. The karst limestone terrain of Guangxi, with its well-drained calcareous soils and subtropical climate, is considered ideal for producing high-quality roots with optimal alkaloid content.

Harvesting Season

Autumn (primarily August to September), or spring (April to May). The roots are dug up, cleaned of stems, leaves, and rootlets, washed, and dried in the sun.

Supplier Information

Treasure of the East

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Miscellaneous Info

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Usage & Safety

How to use this herb and important safety information

Important Medical Disclaimer

The information provided here is for educational purposes only and is not intended as medical advice or to replace consultation with a qualified healthcare professional. This herb is a dietary supplement and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.

Always consult with a qualified healthcare provider, particularly if you are pregnant, nursing, have a medical condition, or are taking other medications. Discontinue use and consult your healthcare provider if you experience any adverse reactions.

Recommended Dosage

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Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

3-6g

Maximum

Do not exceed 6g in decoction. Doses above 10g frequently cause toxic reactions including severe vomiting, neurological damage, and potentially fatal cardiovascular collapse.

Notes

The standard dose of 3-6g must be strictly observed. Even within this range, use the lower end (3g) for mild conditions and shorter courses. For throat conditions, the herb may also be used as a gargle or held in the mouth in small pieces (a traditional method noted since the Song Dynasty). Overdose is the primary cause of toxicity: at around 30g (one liang in traditional measure), poisoning with vomiting, diarrhea, chest tightness, and palpitations is expected. Children and those with weak constitutions require even lower doses. Extended courses of treatment should be avoided to minimize cumulative toxicity risk.

Processing Methods

Processing method

The raw root and rhizome are cleaned of residual stems and impurities, soaked, washed, moistened thoroughly, cut into thick slices, and dried.

How it changes properties

This is the standard prepared form rather than a transformation of properties. The slicing improves extraction of active compounds during decoction. The thermal nature, taste, and channel entry remain unchanged (bitter, Cold, enters Lung and Stomach). This processing does not reduce the herb's toxicity.

When to use this form

This is the standard dispensing form used in all clinical applications. There is no commonly used honey-fried or wine-processed form of this herb.

Toxicity Classification

Toxic

Shan Dou Gen's toxicity comes primarily from its matrine-type alkaloid content (matrine, oxymatrine, sophocarpine, cytisine, and sparteine/司巴丁), which constitute approximately 1.4-1.9% of the dried root. Poisoning typically occurs when doses exceed 10g and can manifest within 5-30 minutes of ingestion. Gastrointestinal reactions appear first (nausea, severe vomiting, abdominal pain, diarrhea). Neurotoxicity is the most serious concern, presenting as dizziness, ataxia (loss of coordination), slurred speech, nystagmus (involuntary eye movement), and blurred vision. In severe cases, it can cause symmetrical damage to the brainstem, cerebellum, and basal ganglia, potentially resulting in permanent neurological disability. Cardiovascular toxicity includes cold extremities, blood pressure drop, and irregular heart rhythm. Respiratory failure and death can occur in the most severe cases. The herb is safe when used within the Pharmacopoeia dosage of 3-6g in decoction. Children are especially vulnerable to toxicity. Processing methods such as water-soaking (changing the water daily for about 4 days) can reduce alkaloid content and toxicity. Combining with Gan Cao (licorice) is traditionally thought to help moderate its harsh properties.

Contraindications

Avoid

Spleen and Stomach deficiency cold (脾胃虚寒): Shan Dou Gen is very bitter and cold. People with weak, cold digestive systems (chronic loose stools, poor appetite, abdominal cold pain) should not take this herb, as it will further injure the Spleen and Stomach Yang.

Avoid

Sore throat due to deficiency fire (虚火喉痹): This herb should not be used for throat conditions caused by Yin deficiency with floating fire, as its intensely cold and bitter nature can further damage Yin and Qi without resolving the root cause. It is only appropriate for throat pain from excess heat-toxin.

Avoid

Excessive dosage: Doses above 6g carry significant risk of poisoning. Doses above 10g frequently cause toxic reactions including severe vomiting, neurological damage, and cardiovascular collapse. Strict adherence to the 3-6g Pharmacopoeia range is essential.

Caution

Pre-existing liver disease: The matrine-type alkaloids in Shan Dou Gen have documented hepatotoxic potential. People with compromised liver function should use this herb with extreme caution or avoid it entirely.

Caution

Pre-existing neurological conditions: Given the documented neurotoxicity of Shan Dou Gen's alkaloid components (affecting the brainstem, cerebellum, and basal ganglia), people with neurological disorders should avoid this herb.

Caution

Cardiac arrhythmia or cardiac disease: Matrine and related alkaloids can affect cardiac rhythm. People with pre-existing heart conditions should use this herb with caution and under close supervision.

Special Populations

Pregnancy

Contraindicated during pregnancy. Shan Dou Gen contains matrine-type alkaloids which have documented neurotoxic and hepatotoxic potential. Given the herb's classification as 'toxic' in the Chinese Pharmacopoeia and the narrow margin between therapeutic and toxic doses, the risk to the developing fetus is unacceptable. The alkaloids may cross the placental barrier and cause developmental toxicity, as suggested by zebrafish embryo studies showing developmental toxicity and neurotoxicity from matrine and sophocarpine. No human safety data exists for use during pregnancy.

Breastfeeding

Not recommended during breastfeeding. Matrine-type alkaloids are small molecules that may transfer into breast milk. Given the documented neurotoxicity of these alkaloids and the extreme sensitivity of infants and young children to Shan Dou Gen poisoning (cases of pediatric poisoning from even standard doses have been documented), the potential risk to a nursing infant is too great. No human studies have assessed the safety of Shan Dou Gen during lactation.

Pediatric Use

Shan Dou Gen should be used with extreme caution or avoided entirely in children. Children are particularly susceptible to its toxic effects. A well-documented case from the 1970s in Beijing involved mass poisoning of kindergarten children who were given a decoction containing Shan Dou Gen for mumps prevention. More recently, a 2018 case resulted in a child suffering severe brain damage from a prescription containing 7g of Shan Dou Gen (which exceeded the safe adult dose). If absolutely necessary under expert supervision, doses for children should be significantly reduced below the adult range and closely monitored. The herb should never be included in pediatric 'preventive' herbal drinks.

Drug Interactions

Hepatotoxic drugs: Shan Dou Gen's matrine alkaloids have documented hepatotoxic potential. Concurrent use with other hepatotoxic drugs (acetaminophen/paracetamol at high doses, methotrexate, certain statins, anti-tuberculosis drugs like isoniazid and rifampicin) may increase the risk of liver injury.

Antiarrhythmic drugs: Matrine and related alkaloids have demonstrated antiarrhythmic activity and can affect cardiac ion channels. Concurrent use with antiarrhythmic medications (amiodarone, quinidine, sotalol) may lead to unpredictable cardiac effects. QT prolongation has been noted in a case involving concurrent ciprofloxacin use with Sophora alkaloids.

CNS depressants: The alkaloids in Shan Dou Gen can suppress higher brain centers. Concurrent use with sedatives, anxiolytics, or other CNS depressants may have additive effects.

Drugs metabolized by cytochrome P450 enzymes: Matrine interacts with CYP450 enzyme systems. Caution is warranted with drugs that are substrates of these enzymes, though specific interaction profiles require further clinical study.

Dietary Advice

Avoid alcohol while taking Shan Dou Gen, as alcohol can increase the absorption and toxicity of alkaloids and compound hepatotoxic risk. Since this is a very cold and bitter herb, avoid cold and raw foods during treatment to protect the Stomach and Spleen from further cold-damage. Light, easily digestible foods are preferred.

Cautions & Warnings

Although this formula is typically safe for most individuals, it may cause side effects in some people. Pregnant women, nursing mothers, postpartum women, and those with liver disease should use the formula with caution.

As with any Chinese herbal remedy, it is advisable to seek guidance from a qualified TCM practitioner before beginning treatment.