Herb

Gou Teng

Gambir stems and thorns | 钩藤

Also known as:

Shuang Gou Teng (双钩藤) , Gou Ding (钩丁)

*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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About This Herb

Traditional Chinese Medicine background and properties

Herb Description

Gou Teng is a gentle, cooling vine-stem herb best known for calming Liver-related headaches, dizziness, and high blood pressure. It is also widely used for childhood convulsions and seizures caused by high fever. An important note for preparation: it should not be boiled for long periods, as prolonged cooking destroys its active compounds.

Herb Category

Main Actions

  • Extinguishes Wind and Stops Spasms
  • Courses the Liver and Drains Heat
  • Calms the Liver and Subdues Yang

How These Actions Work

'Extinguishes Wind and stops spasms' means Gōu Téng calms internal Wind, a TCM concept that describes involuntary movements such as tremors, convulsions, and spasms. Internal Wind in TCM most often arises from the Liver, which governs the smooth movement of tendons and sinews. Gōu Téng's cool nature and sweet taste allow it to gently settle the Liver and calm this stirring Wind. It is widely used for childhood febrile convulsions, epileptic seizures, and the convulsions of eclampsia in pregnancy. Its anti-spasmodic effect is milder than that of Líng Yáng Jiǎo (Antelope Horn) or Quán Xiē (Scorpion), so for severe convulsions it is typically combined with stronger Wind-extinguishing substances.

'Clears Heat and calms the Liver' describes how Gōu Téng's cool thermal nature helps drain mild Heat from the Liver channel. When the Liver generates excess Heat, it can cause a distending headache, red eyes, irritability, and a flushed face. Gōu Téng clears this Liver Heat, bringing relief to these symptoms. Its Heat-clearing power is moderate rather than strong, so for intense Liver Fire it is usually combined with herbs like Huáng Qín (Scutellaria) or Xià Kū Cǎo (Prunella).

'Subdues Liver Yang' refers to Gōu Téng's ability to bring down the overactive ascending force of the Liver. When Liver Yang rises excessively, it causes dizziness, vertigo, throbbing headache, tinnitus, and a sensation of pressure in the head. Gōu Téng gently settles this rising Yang. This is the action most directly linked to its modern use for high blood pressure with symptoms of dizziness and headache. It is often paired with Tiān Má (Gastrodia) or Shí Jué Míng (Abalone Shell) to strengthen this effect.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony that reveal what's out of balance in the body. Gou Teng 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 Gou Teng addresses this pattern

When Liver Yang rises excessively upward, it produces headache, dizziness, and irritability. Gōu Téng enters the Liver channel with a cool, sweet nature that directly subdues this excessive rising Yang. Its gentle descending action settles the hyperactive Liver, relieving the upward pressure that causes head symptoms. This is the pattern most strongly associated with Gōu Téng, and it forms the rationale for its use in hypertension formulas like Tiān Má Gōu Téng Yǐn.

A practitioner would look for one or more of these signs

Dizziness

Especially with a sensation of upward pressure

Headaches

Distending or throbbing headache, often at the temples or vertex

Tinnitus
Hypertension

High blood pressure with dizziness and facial flushing

TCM Properties

Temperature

Cool

Taste

Sweet (甘 gān)

Channels Entered
Liver Pericardium
Parts Used

Stem (茎 jīng)

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 Gou Teng consists of stem segments 2 to 3 cm long, 0.2 to 0.5 cm in diameter, with intact, well-formed double hooks at the nodes (both hooks present and curving downward). The outer surface should be reddish-brown to purplish-red, smooth, and slightly glossy. The texture should be firm and resilient when broken, with a yellowish-brown cross-section showing fibrous bark and a yellowish-white or hollow pith. High hook content (hooks present at most nodes) is the most important quality indicator. The herb should be free of thick old stems (over 6 mm diameter), broken or missing hooks, insect damage, and mould. It should have no particular smell and a bland taste. Pieces that are yellowish-green with visible lenticel spots are from different species and considered lower grade.

Primary Growing Regions

Gou Teng is primarily produced in the southern Chinese provinces. The highest quality habitat (high suitability zones) includes Guangxi, Guizhou, Hunan, and Fujian provinces. Guangxi is particularly notable as a major production and cultivation area. Additional producing regions include Guangdong, Hubei, Jiangxi, Sichuan, Zhejiang, and Yunnan. Guizhou province (especially Jianhe County) has become a major centre for cultivated Gou Teng. The plant also occurs naturally in Japan and Vietnam.

Harvesting Season

Autumn and winter, when the hooked stem branches are cut, leaves removed, and the material is sun-dried.

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

Instructions for safe storage and consumption

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Traditional Dosage Reference

Standard

3-12g

Maximum

Up to 30g in acute hypertension or severe Liver Yang rising, under practitioner supervision. Clinical reports of treating hypertension used doses of 30-60g (2 liang) with good results, though such high doses require careful monitoring.

Notes

Lower doses (3-9g) are appropriate for mild headaches, dizziness, and as part of multi-herb formulas. Higher doses (12-30g) are used for acute hypertension, severe Liver Yang headaches, and high febrile convulsions. Clinical experience with hypertension suggests that doses below 9-15g are often insufficient for meaningful blood pressure reduction, while 30g or more may be needed for significant effect. Excessive prolonged use in patients with Spleen-Stomach deficiency-cold may cause digestive discomfort. The decoction must not be boiled for too long: the active alkaloids decompose after approximately 20 minutes of boiling, significantly reducing therapeutic effect.

Toxicity Classification

Non-toxic

Gou Teng is classified as non-toxic in traditional and modern sources. The Ming Yi Bie Lu explicitly states it is "non-toxic" (无毒). Animal toxicology studies show a wide safety margin: the LD50 of the decoction in mice by intraperitoneal injection is approximately 29 g/kg, and the oral LD50 of total alkaloids is about 515 mg/kg, both far exceeding clinical doses. Sub-acute toxicity testing in rabbits at 2.5 times the therapeutic dose for 10 days showed no signs of toxicity. However, prolonged high-dose administration of the isolated total alkaloids (100 mg/kg daily for two months) in young rats caused pathological changes in the heart, liver, and kidneys. At therapeutic doses, no significant organ damage has been observed. The key alkaloids (rhynchophylline, isorhynchophylline) are the primary active and potentially concerning components at extreme doses.

Contraindications

Caution

People with deficiency-cold constitutions or those without internal Heat or Liver Yang rising should avoid Gou Teng. As a cool-natured herb that clears Heat and subdues Liver Yang, it can worsen cold-type patterns and further deplete Yang Qi.

Caution

Low blood pressure (hypotension). Gou Teng has well-documented blood pressure-lowering effects through vasodilation and central nervous system mechanisms. It may cause excessive drops in blood pressure in those already prone to low readings.

Caution

Concurrent use of strong sedative or antihypertensive medications without dose adjustment. The herb's sedative and hypotensive properties may compound these drug effects, leading to excessive drowsiness or dangerously low blood pressure.

Caution

Active hemorrhage or bleeding disorders. Animal studies show that rhynchophylline (the main alkaloid) can inhibit platelet aggregation and has antithrombotic properties, which may worsen bleeding tendencies.

Special Populations

Pregnancy

Gou Teng has a complex relationship with pregnancy in TCM. On one hand, it is traditionally used to treat pregnancy eclampsia (子痫, zi xian), a dangerous condition of convulsions and high blood pressure during pregnancy, as seen in the classical formula Gou Teng Tang from the Tai Chan Xin Fa. On the other hand, animal studies show that rhynchophylline can stimulate uterine smooth muscle in rats. Because of its cool nature and blood pressure-lowering properties, it should only be used during pregnancy under the guidance of a qualified practitioner, for specific indications such as eclampsia, and not as a casual supplement. Modern sources list pregnant women as a caution group.

Breastfeeding

There is limited specific data on Gou Teng's safety during breastfeeding. While the herb is classified as non-toxic and has a long history of safe use in paediatric practice, the alkaloid components (rhynchophylline, isorhynchophylline) could theoretically pass into breast milk. The sedative and blood pressure-lowering effects are a theoretical concern for nursing infants. Use during breastfeeding should be under practitioner supervision, at standard doses, and for limited duration.

Pediatric Use

Gou Teng has an exceptionally long history as a paediatric herb; for the first thousand years of its recorded use, it was considered exclusively a children's medicine. It is gentle and well-tolerated, commonly used for childhood febrile convulsions, night crying due to Heat, and fright syndromes. Dosage should be adjusted by age: approximately one-third of the adult dose for infants, and one-half to two-thirds for children aged 3 to 12. As with adult use, it must be added late in the decoction (last 5 to 15 minutes) to preserve its active alkaloids.

Drug Interactions

Antihypertensive medications: Gou Teng has well-documented blood pressure-lowering effects through vasodilation and reduced peripheral resistance. Combined use with pharmaceutical antihypertensives (ACE inhibitors, ARBs, calcium channel blockers, beta-blockers) may result in additive hypotensive effects and an excessive drop in blood pressure. Blood pressure should be monitored closely.

Sedatives and CNS depressants: The herb has demonstrated sedative effects in animal models, reducing cortical excitability. Combined use with benzodiazepines, barbiturates, or other sedative-hypnotic drugs may potentiate drowsiness or over-sedation.

CYP3A4-metabolised drugs: A recent pharmacokinetic review noted that the alkaloids of Gou Teng undergo significant first-pass metabolism via CYP3A4. There is a theoretical potential for interaction with drugs that are also substrates or inhibitors of this enzyme pathway, though this has not been confirmed clinically.

Anticoagulants and antiplatelet agents: Rhynchophylline has shown significant platelet aggregation inhibition and antithrombotic effects in animal studies. Caution is warranted when combining with warfarin, heparin, aspirin, or clopidogrel.

Dietary Advice

Avoid excessive alcohol consumption while taking Gou Teng, as both have blood pressure-lowering and sedative effects that may compound each other. Avoid excessively greasy, spicy, or Heat-producing foods (deep-fried foods, chilli, lamb), as these may aggravate the Liver Yang or Liver Fire conditions that Gou Teng is typically prescribed to treat. A diet emphasizing cooling vegetables, leafy greens, and light, easily digested foods supports the herb's therapeutic direction.

Cautions & Warnings

Although this herb 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.