Guā Lóu (栝楼) — Trichosanthes Fruit

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Incompatibilities
7. Cautions and contraindications
8. Treatment at my clinic
9. Frequently asked questions

1. Overview

Guā Lóu (栝楼) is the ripe fruit of Trichosanthes kirilowii, known in English as Chinese snake gourd or Trichosanthes fruit. The fruit shell (Guā Lóu Pí), the seed (Guā Lóu Rén) and the root (Tiān Huā Fěn) are also used separately for distinct actions. It belongs to the category of Cool herbs that transform Phlegm-Heat and is one of the principal herbs for chest oppression, sticky productive cough and Phlegm-Heat patterns in Chinese herbal medicine.

I prescribe Guā Lóu as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan — independently tested to the highest international quality and safety standards. Herbs are always combined with other herbs selected to match the patient’s individual TCM pattern. Online consultations are available for patients who cannot attend my clinic in person.

2. Properties

3. Actions and indications

Principal actions

1. Clears Heat and transforms Phlegm
2. Expands the chest and disperses focal distension
3. Moistens the Intestines and the Lungs
4. Disperses lumps and reduces abscess (especially breast)

Indications

1. Lung Phlegm-Heat with thick, sticky, yellow phlegm and difficult expectoration
2. Chest oppression and focal distension associated with Phlegm-Heat (within TCM treatments of angina-pectoris-type chest patterns)
3. Constipation with dry stools from Heat or dryness
4. Early-stage breast abscess and mastitis from Heat with Phlegm accumulation

4. Key formulas containing Guā Lóu

Guā Lóu is an important component of Gua Lou Xie Bai Bai Jiu Tang (Trichosanthes, Macrostem Onion and White Wine Decoction) for chest Bi syndrome with Phlegm obstructing the chest, and a number of formulas for Phlegm-Heat in the Lungs.

5. Modern research

Trichosanthes fruit and seed contain triterpenoid saponins, fatty oils, sterols and trichosanthin (a protein with antiviral and immunomodulatory activity studied separately). Pharmacological studies report anti-inflammatory, expectorant, mild laxative and antimicrobial effects, and protective effects on cardiac tissue in ischaemia models. Trichosanthin (derived from the root) has been investigated for antiviral and oncological applications, though it is not the form prescribed in standard herbal practice.

6. Incompatibilities

The classical Ming-dynasty texts Shi Ba Fan (Eighteen Antagonisms) and Shi Jiu Wei (Nineteen Mutual Inhibitions) record herb pairs that should not be combined. Modern practitioners treat these as strong cautions rather than absolute contraindications — classical training avoids the combinations except in carefully supervised low-dose protocols.

Guā Lóu (栝楼) Trichosanthes Fruit should not normally be combined with:

• Fu Zi — per the Shi Ba Fan
• Chuan Wu — per the Shi Ba Fan
• Cao Wu — per the Shi Ba Fan

7. Cautions and contraindications

Contraindicated in cold-deficient diarrhoea and Spleen Yang deficiency. Traditionally considered incompatible with Wu Tou (aconite). The seed's oil content can loosen the stool; use carefully in patients with chronic loose stools.

Pattern contraindications

Contraindicated in Cold patterns and Spleen Yang deficiency. Some (e.g. Gua Lou family) have mild laxative effect — caution in chronic diarrhoea.

Modern drug interactions

Generally well tolerated. Tell your doctor if on regular medication.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Never self-prescribe or self-administer Chinese herbs without professional guidance. Dr (TCM) Attilio D’Alberto is a member of the RCHM and the British Acupuncture Council with over 25 years of clinical experience.

8. Treatment at my clinic

I prescribe Guā Lóu as part of tailored herbal formulas for productive cough with Phlegm-Heat, chronic chest tightness from Phlegm patterns, and selected presentations of cyclical breast tenderness and early mastitis. Every prescription is individually formulated following a full TCM assessment.

Online Chinese herbal medicine consultations are available for patients throughout the UK and internationally, with herbs dispensed by post. Visit the prices page for consultation fees.

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9. Frequently asked questions

What is Gua Lou used for?

Guā Lóu is used within Chinese herbal medicine for Phlegm-Heat patterns: thick, sticky, yellow phlegm with a productive cough, a feeling of oppression or tightness in the chest, and dry constipation from heat. It is always combined with other herbs matched to the individual’s TCM pattern rather than taken alone.

What is the difference between Gua Lou, Gua Lou Pi, Gua Lou Ren and Tian Hua Fen?

They come from the same plant but are prescribed for different actions. Guā Lóu is the whole ripe fruit. Guā Lóu Pí (the fruit shell) focuses on opening the chest and clearing Phlegm-Heat. Guā Lóu Rén (the seed) moistens the Intestines and Lungs and gently moves the stool. Tiān Huā Fěn (the root) generates fluids and clears heat. A herbalist selects the part that fits the pattern.

Can Gua Lou help a chesty cough?

It may help within a formula when the cough fits the TCM Phlegm-Heat picture — sticky yellow phlegm and chest tightness — and is used as a complementary therapy alongside conventional care, not as a replacement for it. A persistent cough, breathlessness or coughing up blood should always be assessed by your doctor.

Is Gua Lou used for breast lumps or mastitis?

In traditional practice it is used within formulas for early-stage breast abscess and mastitis of the Heat-with-Phlegm type, alongside conventional care. This is important: any new or persistent breast lump must be assessed by your doctor or breast clinic first, as it needs proper medical investigation. Herbal treatment is only ever supportive, not a substitute for that assessment.

Is Gua Lou safe?

Used correctly by a qualified herbalist it is well tolerated. It is a cold herb, so it is not suitable for cold, Spleen-Yang-deficient patterns or chronic loose stools, and it is traditionally not combined with aconite herbs (Fu Zi, Chuan Wu, Cao Wu). Always have it prescribed by a herbalist registered with the RCHM, and tell them about any regular medication.

Prefer to be treated from home? Chinese herbal medicine online consultations are available throughout the UK and worldwide. After a full video consultation, Dr (TCM) Attilio D'Alberto formulates a bespoke herbal prescription and posts your Chinese herbs directly to your door.