Roots and rhizomesHeat-clearingRadix Trichosanthis

Gua Lou Gen (Trichosanthes Root)

Q: What is Gua Lou Gen? Are Gua Lou, Gua Lou Pi and Gua Lou Zi the same?

The pharmacopoeial name is Tian Hua Fen (天花粉), which is Gua Lou Gen (瓜蒌根): the dried root of Trichosanthes kirilowii or Trichosanthes rosthornii . The pharmacopoeial name is Trichosanthis Radix . Gua Lou is the ripe fruit: clears heat, washes phlegm, loosens the chest, dissipates nodes and moistens dryness to free the stool. Gua Lou Pi leans to moving qi and loosening the chest. Gua Lou Zi leans to moistening the Lung, transforming phlegm and slipping the intestines. Same plant, different parts—do not mix by equal weight. Write Tian Hua Fen or Gua Lou Gen. Use caution in Spleen-Stomach vacuity cold. It antagonizes aconite.

Q: What are the TCM properties and traditional uses of Gua Lou Gen?

According to the Chinese Pharmacopoeia, Tian Hua Fen is sweet, slightly bitter and slightly cold , enters the Lung and Stomach channels, and acts to clear heat, drain fire, generate fluid, quench thirst, disperse swelling and expel pus . It is used for heat disease with vexing thirst, Lung-heat dry cough, internal-heat wasting-thirst, and sores and swellings. Sweet, slightly bitter and slightly cold, it suits heat damaging fluid and sores—not Spleen-Stomach vacuity cold, loose stool or cold-phlegm.

Q: What is the usual dosage? Can it be drunk daily as a fluid-generating tea?

The pharmacopoeial decoction dose is 10–15 g . It is not a four-season “trichosanthes fluid tea.” Without heat, cold only injures Spleen yang. Vexing thirst and wasting-thirst need a practitioner to name a short course; it does not replace glucose and infection assessment.

Q: How do you choose and store Gua Lou Gen?

Choose nearly white slices, abundant starch, obvious vessel pores and a slightly bitter taste . Moldy, moth-eaten, dark starchless or dirty lots are discarded. Store dry against moths. Buy pharmacopoeial Tian Hua Fen; do not replace clearing heat, draining fire, generating fluid, quenching thirst, dispersing swelling and expelling pus with trichosanthes fruit or seed by equal weight.

A practical guide to Gua Lou Gen: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

View Herb Profile →

Last reviewed Oct 13, 2026

Quick Facts

Latin Name	Radix Trichosanthis
Chinese Name & Pinyin	瓜蔞根 · Gua Lou Gen
Medicinal Part	Roots and rhizomes
The herb	Gua Lou Gen is Tian Hua Fen, the dried root of Trichosanthes kirilowii or T. rosthornii. Gua Lou, Gua Lou Pi, and Gua Lou Ren are different parts of the same plant. Incompatible with aconite.
Nature and channels	Sweet, slightly bitter, slightly cold. Enters the Lung and Stomach. Sweetness generates fluids. Slight bitter cold clears heat, drains fire, reduces swelling, and discharges pus.
Pharmacopoeia line	Clears heat and drains fire. Generates fluids and stops thirst. Reduces swelling and discharges pus. Used for febrile thirst, Lung-heat dry cough, interior-heat wasting-thirst, and sores.
Pattern cues	Vexing thirst. Dry cough. Wasting-thirst. Swollen sores. Red tongue with little fluid.
In this article	Root versus fruit, peel, and seed. Generating fluids versus moistening the intestines. Why it must not sit with aconite. Why pregnancy is a caution. Who should skip it.

What Is Gua Lou Gen?

Gua Lou Gen is the pharmacopoeia drug Tian Hua Fen (天花粉; Guā Lóu Gēn / Tiān Huā Fěn; Latin: Trichosanthis Radix; English: snake gourd root). It is the dried root of Trichosanthes kirilowii Maxim. or Trichosanthes rosthornii Harms. In Chinese medicine it is a heat-clearing, fire-draining herb. It is sweet, slightly bitter, and slightly cold, enters the Lung and Stomach channels, and its core actions are to clear heat and drain fire, generate fluids and stop thirst, and reduce swelling and discharge pus. It is not Gua Lou. The fruit clears heat, washes phlegm, eases the chest, dissipates nodules, and moistens the intestines. It is not Gua Lou Pi or Gua Lou Ren. The peel leans toward easing the chest and transforming phlegm. The seed leans toward moistening the intestines. The root is specific for generating fluids, stopping thirst, reducing swelling, and discharging pus. Do not combine it with Chuan Wu, Cao Wu, or Fu Zi. Use caution in pregnancy. A cold weak spleen and loose stools are a poor match. Wasting-thirst needs pattern diagnosis. This is not a blood-sugar-drug claim.

It is used most often for three patterns:

Febrile vexing thirst — thirst from damaged fluids
Lung-heat dry cough, interior-heat wasting-thirst — wasting-thirst needs a clinic
Sores and swollen toxin — reducing swelling and discharging pus needs pattern diagnosis

The usual decoction dose is 10–15 g. Sweet, slightly bitter, and slightly cold, it is not a daily “fluid pollen tea.” Thirst with no heat, and middle-cold diarrhea, get worse if more clearing is added.

When blazing heat damages fluids, or heat-toxin binds, thirst, dry cough, and swollen sores are common. Gua Lou Gen is sweet-cold. It clears, generates fluids, and discharges pus, which is why Tian Hua Fen appears in Bai Hu Jia Ren Shen Tang–type formulas. It clears and moistens more than it warms. Phlegm-damp with a greasy coating and loose stools loosen further if more is added.

Gua Lou Gen is not a catch-all fluid or wasting-thirst root. In middle-cold diarrhea, combined with aconite, or in pregnancy, using it alone is not appropriate. Whether it belongs in a formula should be decided by a licensed Chinese medicine practitioner after pattern diagnosis and a check of contraindications.

Gua Lou Gen: Materia Medica Profile

Identification & Quality Standard

Radix Trichosanthis

Botanical Origin

The dried root of Trichosanthes kirilowii Maxim. or Trichosanthes rosthornii Harms (Cucurbitaceae); also known as Tian Hua Fen.

Production Regions

Primarily produced in the Chinese provinces of Henan, Shandong, Hebei and Sichuan.

Quality Requirements

Superior medicinal material is white, powdery, and free of fibrous wood.

Macroscopic Features

Irregular cylindrical or petal-like pieces, 5~15cm long; externally yellowish-white; fracture white and powdery; taste slightly bitter.

3 Core Producing Regions and Quality Identification

Traditionally, high-quality roots come from regions like Shandong, Henan, and Hebei, though quality also depends on harvest time and processing methods.

Appearance: Premium Tian Hua Fen (Trichosanthes Root) is cylindrical, yellowish-white, and solid.
Texture & Taste: The cross-section is white and starchy with fine radial patterns. It has a mild odor and a slightly bitter taste.
Caution: Be careful not to confuse it with the root of a related species, Shuang Bian Gua Lou, which is harder, less starchy, and has a weaker odor.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Sweet, Slightly bitter; Slightly coldLungStomach

1. 2 Historical Herbal Records

Historical TCM texts focus heavily on its cooling and moistening traits:

Shen Nong Ben Cao Jing classified it as a middle-grade herb, noting its use for severe thirst, body heat, and restoring the body's center.
Ming Yi Bie Lu added that it helps reduce swelling and promotes urination.
Ben Cao Gang Mu mentioned its use in clearing heat-related toxins and resolving swelling.

2. 3 Evolution of Herbal Understanding

Different historical TCM doctors had varying views on its application:

Some emphasized its strong heat-clearing nature, warning that it should not be used by individuals with a cold Spleen and Stomach deficiency.
Others noted its mild "fluid-generating" properties, suggesting it could be used for mild fluid deficiency. However, all agreed that it is a clearing herb, not a primary tonic, and has specific limitations.

Core Efficacies & Traditional Applications

Traditional Functions

Clears heat, generates fluids, moistens the lung, and discharges pus. Apply to thirst from heat injuring fluids, dry cough, and sores that will not ulcerate or drain.

1. 1 First Primary Action: Clearing Heat and Generating Fluids

Traditionally, Gua Lou Gen (Trichosanthes Root) is used to clear heat from the Lung and Stomach and promote the generation of body fluids.

Common Symptoms: It's often used for signs of "heat" damaging body fluids, such as dry mouth and throat, dry cough with little phlegm, a red tongue with little moisture, and dry stools.
Common Pairings: To boost its moistening effects, it is usually paired with herbs like Mai Dong (Ophiopogon Tuber) and Yu Zhu (Solomon's Seal).
Caution: People with a cold and weak Spleen and Stomach (often experiencing stomach aches, loose stools, or sensitivity to cold) should not use this on their own.

2. 2 Second Primary Action: Reducing Swelling and Draining Pus

Another traditional use is clearing "heat-toxins" to help reduce swelling and drain pus.

Common Symptoms: It's used for red, swollen, and painful skin sores or internal localized swelling where pus is forming but hasn't ruptured, driven by intense heat-toxins.
Common Pairings: For this purpose, it is frequently combined with heat-clearing and detoxifying herbs like Jin Yin Hua (Honeysuckle Flower) and Lian Qiao (Forsythia Fruit).
Caution: If you have a weak digestive system and no clear signs of heat-toxins, you should avoid using it.

3. 3 Common Single Herb Pairing: The Herb Pair

A very common pairing is Gua Lou Gen (Trichosanthes Root) with Shan Yao (Chinese Yam).

Synergy: Gua Lou Gen clears heat and generates fluids, while Shan Yao strengthens the Spleen and boosts Qi. Together, they clear internal heat without damaging the stomach.
Best For: This combo is great for mild cases of heat-induced fluid loss combined with mild digestive weakness (like dry mouth, slight loss of appetite, and dry stools without stomach pain). However, it should only be used after a professional assessment.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. 1 Main Chemical Components

Modern laboratory research has identified several components in Tian Hua Fen (Trichosanthes Root), including:

Polysaccharides
Amino acids
Saponins
Proteins and trace elements

While in-vitro (test tube) experiments show these components may help regulate cell metabolism, these lab results do not directly equate to effects in the human body after oral consumption.

2. 2 Modern Pharmacological Research Directions

Current research mostly focuses on screening these active ingredients. For instance, some animal and cell studies observe how its polysaccharides might support energy metabolism. However, these are foundational studies and should not be treated as proven clinical treatments for humans.

3. 3 Limitations of Modern Research

When looking at modern studies of this herb, keep a few things in mind:

Lab vs. Real Life: Controlled lab environments do not account for human digestion, diet, or individual body constitutions.
Extracts vs. Whole Herb: Highly concentrated extracts or single isolated chemicals used in labs are completely different from the traditional boiled herbal decoctions.
Synergy: Traditional Chinese Medicine relies on the combined, synergistic effect of the whole plant and formula, not just a single active ingredient. One chemical's lab result cannot represent the holistic effect of the herb.

Comparing Similar Herbs

1. 2 Similarities with Comparable Herbs

Both Gua Lou Gen (Trichosanthes Root) and Shan Yao (Chinese Yam) share a few traits:

Both can help generate fluids to relieve dry mouth.
Both can be used for conditions involving fluid deficiency caused by heat or weak Qi.
Both might show up in daily dietary wellness recipes, requiring you to pay attention to your constitution and dosage.

2. 3 Core Differences

Nature and Focus: Gua Lou Gen is cold, sweet, and slightly bitter. It primarily focuses on clearing heat and producing fluids. Shan Yao is neutral and sweet. It acts as a gentle tonic, focusing on strengthening the Spleen and Qi to help the body generate its own fluids naturally.
Action Mechanism: Gua Lou Gen pushes heat downward and out of the body. Shan Yao gently nourishes and strengthens digestive functions without aggressively clearing heat.
Clinical Indications: Gua Lou Gen is best when there are obvious signs of "heat" (like dark yellow urine, dry stools, a red tongue, or swollen sores). Shan Yao is better for signs of a weak digestive system (like poor appetite, bloating after meals, loose stools, or general fatigue).
Contraindications: Because it is cold, Gua Lou Gen can worsen symptoms for people with cold digestions (loose stools, frequent stomachaches). Shan Yao is neutral and generally safe, though excessive use might cause bloating in people with heavy "damp-heat."

3. 4 One-Sentence Summary

In short, Gua Lou Gen (Trichosanthes Root) is a cooling herb that clears heat and reduces swelling, while Shan Yao (Chinese Yam) is a gentle tonic that strengthens digestion to naturally boost fluids; they relieve dry mouth through entirely different methods.

Classical Formulas Containing Gua Lou Gen

Chai Hu Gui Zhi Gan Jiang Tang

柴胡桂枝乾薑湯

Formula CategoryHarmonising FormulasPrimary PatternQi StagnationPrimary FunctionHarmonise Shaoyang, warm and transform fluidsRelated ConditionsFever·Chest Tightness·Dry Mouth & Throat·Abdominal Pain

View Formula Profile Read Complete Guide

Formulas vs. Single Herbs

Synergy is Key: A formula is a balanced team. The healing power comes from how the herbs interact, so a single herb cannot simply replicate a full formula's effects.
Holistic Balance: The exact dosage and combination in a formula affect the entire body. Never try to mix or alter these formulas at home based on internet articles.

Diet & Daily Home Use

1. 1 Home Tea or Dietary Application

Gua Lou Gen and Mai Dong Tea:
- Ingredients: 3g Gua Lou Gen (Trichosanthes Root), 3g Mai Dong (Ophiopogon Tuber), 1g Ju Hua (Chrysanthemum Flower).
- Method: Place the herbs in a cup, pour boiling water over them, cover, and steep for 10 minutes. You can refill with hot water until the taste fades.
- Best For: Occasional mild dry mouth or dry throat caused by dry environments or staying up late.
- Limits: Drink 1 cup, 2-3 times a week. Do not drink it continuously long-term.
- Caution: Not for people with a cold digestive system, frequent stomach aches, or loose stools.

2. 2 Preparation Differences

The raw form of Gua Lou Gen is better at clearing heat, while processed versions are milder for generating fluids. For home boiling, no special steps are needed. Just soak the herbs in water for 30 minutes, bring to a boil, and simmer on low heat for 20 minutes. Keep in mind that you cannot directly swap raw herb doses with concentrated herbal extract powders.

3. 3 Dosage and Usage Cycle

Dosage: Clinical doses range from 10-15 grams, but home dietary doses should be halved to 3-5 grams. Dietary doses are for mild support, not medical treatment.
Cycle: Do not use for more than 1 week continuously. If symptoms persist, consult a professional. Vulnerable groups (pregnant women, children, elderly) must consult a doctor before use.

Contraindications & Safety Warnings

1. 1 Not Suitable For

Cold Digestion: People who are prone to stomach aches, loose stools, or feel constantly cold should avoid it.
Vulnerable Groups: Pregnant and nursing women should be very cautious and consult a doctor first, as safety data is limited. Children and the elderly should strictly control dosages under professional guidance.
Underlying Conditions: Those with liver or kidney dysfunction must consult a doctor. Anyone allergic to the gourd family (Cucurbitaceae) should avoid it.

2. 2 Drug Interactions and Dietary Notes

Medications: It may interact with blood thinners, affecting blood clotting, or enhance the effects of blood sugar-lowering drugs, potentially causing low blood sugar. Always talk to your doctor if you are on these medications.
Diet: While traditional "food combining" myths aren't heavily backed by science, this herb can interact with specific Western medications, so always consult a pharmacist or doctor if you are taking prescription drugs.

3. 3 Adverse Reactions and Risks

When used at normal doses, it is generally safe. However, taking too much can cause mild gastrointestinal upset, like nausea or bloating. If you experience allergic reactions (rash, itching), continuous vomiting, difficulty breathing, or if your symptoms rapidly worsen, stop using it immediately and seek medical help. Do not try to manage severe reactions on your own.

Frequently Asked Questions About Gua Lou Gen

What is Gua Lou Gen? Are Gua Lou, Gua Lou Pi and Gua Lou Zi the same?

The pharmacopoeial name is Tian Hua Fen (天花粉), which is Gua Lou Gen (瓜蒌根): the dried root of Trichosanthes kirilowii or Trichosanthes rosthornii. The pharmacopoeial name is Trichosanthis Radix. Gua Lou is the ripe fruit: clears heat, washes phlegm, loosens the chest, dissipates nodes and moistens dryness to free the stool. Gua Lou Pi leans to moving qi and loosening the chest. Gua Lou Zi leans to moistening the Lung, transforming phlegm and slipping the intestines. Same plant, different parts—do not mix by equal weight. Write Tian Hua Fen or Gua Lou Gen. Use caution in Spleen-Stomach vacuity cold. It antagonizes aconite.

What are the TCM properties and traditional uses of Gua Lou Gen?

According to the Chinese Pharmacopoeia, Tian Hua Fen is sweet, slightly bitter and slightly cold, enters the Lung and Stomach channels, and acts to clear heat, drain fire, generate fluid, quench thirst, disperse swelling and expel pus. It is used for heat disease with vexing thirst, Lung-heat dry cough, internal-heat wasting-thirst, and sores and swellings. Sweet, slightly bitter and slightly cold, it suits heat damaging fluid and sores—not Spleen-Stomach vacuity cold, loose stool or cold-phlegm.

Does Gua Lou Gen need special processing? Can Gua Lou replace it?

Remove foreign matter, wash, soften and cut thick slices, then dry. Trichosanthes fruit transforms phlegm, loosens the chest and moistens the intestines; it cannot replace generating fluid, quenching thirst, dispersing swelling and expelling pus by equal weight. Commercial pollen tea is not equal-weight pieces. Trichosanthin injection is a different preparation and cannot replace the pieces on your own.

What is the usual dosage? Can it be drunk daily as a fluid-generating tea?

The pharmacopoeial decoction dose is 10–15 g. It is not a four-season “trichosanthes fluid tea.” Without heat, cold only injures Spleen yang. Vexing thirst and wasting-thirst need a practitioner to name a short course; it does not replace glucose and infection assessment.

What are the contraindications? Can it be used in pregnancy?

Unsuitable in Spleen-Stomach vacuity cold and slippery diarrhea. Do not combine with aconite. Use caution in pregnancy; do not self-medicate. Stop if diarrhea appears. Thirst with copious urine and weight loss, or spreading sores, need medical care.

Can Gua Lou Gen clear heat, drain fire, generate fluid, quench thirst, disperse swelling and expel pus?

It can help heat disease with vexing thirst and internal-heat wasting-thirst. Wasting-thirst may enter a Yu Ye Tang type formula, with Chinese yam, astragalus, anemarrhena and pueraria after pattern differentiation. Early sores may enter Xian Fang Huo Ming Yin, with honeysuckle, angelica dahurica and spiny gleditsia. It clears heat, drains fire, generates fluid, quenches thirst, disperses swelling and expels pus—not a specific for every diabetes or every sore.

Can Gua Lou Gen be drunk daily as a thirst, glucose or sore tea?

Heat damaging fluid may enter a short formula; vacuity cold only loosens the stool further as it clears. “Trichosanthes root must lower glucose” does not replace glucose assessment. Clearing heat, draining fire, generating fluid and quenching thirst should name 10–15 g and write Tian Hua Fen.

How do you choose among Gua Lou Gen, Gua Lou, Zhi Mu, Lu Gen and Ge Gen?

Trichosanthes root is sweet, slightly bitter and slightly cold: clears heat, drains fire, generates fluid, quenches thirst, disperses swelling and expels pus—heat disease with thirst and sores. Trichosanthes fruit is sweet, slightly bitter and cold: clears heat, washes phlegm, loosens the chest, dissipates nodes and moistens dryness—phlegm-heat chest impediment. Anemarrhena is bitter-sweet and cold: clears heat, drains fire, enriches yin and moistens dryness—steaming bone and wasting-thirst. Reed rhizome is sweet-cold: clears heat, drains fire, generates fluid, quenches thirst, eliminates vexation and stops vomiting—thirst in heat disease. Pueraria is sweet-acrid and cool: releases the flesh, abates fever, generates fluid, quenches thirst, vents rash and raises yang to stop diarrhea—stiff nape and wasting-thirst. Damaged fluid with thirst favors Tian Hua Fen; phlegm-heat chest oppression favors Gua Lou; yin-vacuity heat favors Zhi Mu; vomiting with thirst favors Lu Gen; stiff nape with diarrhea favors Ge Gen. They may be paired; Spleen-Stomach vacuity cold forbids large Tian Hua Fen and Zhi Mu, and Tian Hua Fen antagonizes aconite.

Which herbs is Gua Lou Gen combined with? What are the representative formulas?

Internal-heat wasting-thirst joins Chinese yam, astragalus, anemarrhena and pueraria in Yu Ye Tang. Early sores join honeysuckle, angelica dahurica and spiny gleditsia in Xian Fang Huo Ming Yin. Write Tian Hua Fen 10–15 g; do not replace it with trichosanthes fruit by equal weight, and do not combine it with processed aconite, Sichuan aconite or wild aconite.

How do you choose and store Gua Lou Gen?

Choose nearly white slices, abundant starch, obvious vessel pores and a slightly bitter taste. Moldy, moth-eaten, dark starchless or dirty lots are discarded. Store dry against moths. Buy pharmacopoeial Tian Hua Fen; do not replace clearing heat, draining fire, generating fluid, quenching thirst, dispersing swelling and expelling pus with trichosanthes fruit or seed by equal weight.

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Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.