Bā Dòu (巴豆) — Croton seed
On this page
- Overview
- Properties
- Actions and indications
- Key formulas
- Modern research
- Incompatibilities
- Cautions and contraindications
- Treatment at my clinic
1. Overview
Bā Dòu (巴豆) — Croton tiglium — is known in English as Croton seed. It belongs to the category of toxic drastic purgatives in the Chinese Materia Medica and is used in Chinese herbal medicine both as a component of classical herbal formulas and within tailored prescriptions in traditional Chinese medicine (TCM).
I prescribe Bā Dòu 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 never prescribed individually outside a properly balanced formula; they 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
| Pinyin name | Bā Dòu |
|---|---|
| Chinese characters | 巴豆 |
| Latin name | Croton tiglium |
| English name | Croton seed |
| Nature | Hot |
| Flavour | Acrid; very toxic |
| Channels entered | Stomach, Large Intestine, Lung |
| Category | Drain downward |
3. Actions and indications
Principal actions
- Drastically purges accumulation and Cold
- Drives out water and reduces swelling
Indications
- Historically used for severe constipation from Cold accumulation
- Historically used for severe fluid accumulation
4. Key formulas containing Bā Dòu
Bā Dòu is an ingredient in a number of classical formulas. The following are among the most important:
See the full Chinese herbal medicine formula directory for detailed information on all 332 classical formulas.
5. Modern research
Croton seed contains phorbol esters, which are severely irritant to skin and mucous membranes and are tumour-promoting in laboratory models. Even small internal doses cause violent purgation and can be fatal.
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.
The drastic water-draining herbs Gan Sui, Yuan Hua and Da Ji are classically incompatible with Gan Cao under the Shi Ba Fan, and Ba Dou with Qian Niu Zi. Since Bā Dòu is not used in practice, the question does not arise clinically.
7. Cautions and contraindications
Very toxic. Ba Dou is not used. Skin contact alone can cause blistering. It is incompatible with Qian Niu Zi and is contraindicated in pregnancy and in the weak or elderly.
Pattern contraindications
There is no pattern in which this drastic purgative is appropriate in modern outpatient practice.
Modern drug interactions
No specific drug interactions are well established for Bā Dòu at normal prescribed doses. As with all Chinese herbs, tell your herbalist about every prescribed medication so the formula can be reviewed for interactions and adjusted where necessary.
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. Availability at my clinic
I do not prescribe Bā Dòu. This page is provided for reference and safety information only.
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.
Return to the Chinese herb directory or the Chinese herbal medicine main page.
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.
