Ba Dou (Croton Seed)

Chinese Herb Actions

Chinese Herb Dosage

• What dosage of Ba Dou is recorded in the reference literature?

  The Sacred Lotus record carries a published reference figure of 0.1–0.3 grams — roughly a hundredth to a thirtieth of a routine herb dose, and among the very smallest dose figures anywhere in the materia medica. That number is reproduced here as bibliographic reference literature only. It is not a prescription, not a preparation instruction, and not a quantity anyone should act on: it records how narrow the historical margin was considered to be, not how the substance should be used.

  • Why the figure is so small — croton seed material is dominated by an oil rich in tigliane diterpenoids (phorbol esters), which are among the most potent irritant and biologically active plant compounds known. Effect and harm sit extremely close together, which is precisely why the recorded ceiling is a fraction of a gram.
  • Raw seed is not a usable material — the classical literature is unanimous that unprocessed croton seed was never given as-is. Modern analytical work confirms that traditional processing measurably lowers both the purgative effect and the measured phorbol-ester (phorbol-12-myristate-13-acetate) and crotonic acid content of the seed, though the same study notes that the processing traditions had not previously been tested for effectiveness. This is stated here as an analytical finding, not as a method.
  • Professional context only — where Ba Dou appears at all in modern practice it is within prepared classical formulas, dispensed and supervised by a qualified practitioner. It has no role in self-administration.

  Source: Sacred Lotus recorded reference range (0.1–0.3 g); PMID 40869036, PMC 12386474, DOI 10.3390/ijms26167714 (quantification of phorbol-12-myristate-13-acetate and crotonic acid in croton seed before and after traditional processing, with purgative and acute-toxicity assays); PMID 35723937 (toxicology review). Reference literature only — not a prescription, preparation, processing or self-use instruction.

Chinese Herb Contraindications & Cautions

• Is Ba Dou safe? What are the contraindications?

  No — Ba Dou is one of the most dangerous substances in the entire materia medica, and every reference source treats it as restricted, professional-supervision-only material. The Sacred Lotus record carries an absolute pregnancy contraindication, noting documented teratogenic (birth-defect) effects, together with contraindication in weak or debilitated patients, the Qian Niu Zi incompatibility, and the classical instruction to avoid hot liquids alongside it.

  • Pregnancy — absolutely contraindicated. This is not a relative caution. Drastic purgatives are contraindicated in pregnancy as a class, and Ba Dou is the most drastic of them.
  • Debilitated, elderly, frail or paediatric patients — contraindicated. The recorded rationale is that a drastic purge is survivable only where there is substantial underlying strength.
  • Never combined with Qian Niu Zi — the recorded classical incompatibility (see the comparison section above).
  • Not for self-use in any form. Croton seed and croton oil are irritant poisons. There is no context in which unsupervised use is appropriate, and this reference deliberately provides no preparation, processing or administration guidance.
  • Handling — the phorbol esters that make the seed toxic are also intensely irritant on contact with skin, eyes and mucous membranes; the raw material is treated as hazardous to handle, not merely to ingest.

  Source: Sacred Lotus cautions record (pregnancy/teratogenicity, debility, Qian Niu Zi incompatibility, hot liquids); Sacred Lotus incompatibility pairing record; PMID 35723937, DOI 10.1093/jpp/rgac040 (toxicological review of Croton tiglium); materia medica consensus on harsh expellants, cross-referenced against multiple online sources. Reference information only — not medical advice.

Chinese Herb Toxicity & Overdose

• How toxic is Ba Dou, and what are phorbol esters?

  Ba Dou is toxic in two distinct and separately documented ways: as an acute irritant poison, and as a laboratory-standard tumour promoter. Both trace to the same class of constituents — the tigliane diterpenoids, better known as phorbol esters, which are concentrated in the seed oil (croton oil).

  • Acute irritant toxicity — croton oil is a violent purgative and a severe irritant to skin, eyes and the gastrointestinal mucosa. Analytical work has quantified phorbol-12-myristate-13-acetate and crotonic acid directly in croton seed powder and correlated their reduction with reduced purgative effect, confirming that these constituents are the active and toxic principles rather than incidental compounds.
  • Tumour promotion — the historically important point. Croton oil is the original tumour-promoting agent of experimental carcinogenesis. In the classical two-stage mouse-skin model, an initiating carcinogen alone produces few or no tumours, but repeated application of croton oil afterwards converts initiated cells into papillomas. The active promoter isolated from croton oil, 12-O-tetradecanoylphorbol-13-acetate (TPA, also written phorbol 12-myristate 13-acetate or PMA), became — and remains — the standard laboratory tumour promoter worldwide. This is well-established, uncontested pharmacology.
  • Mechanism — phorbol esters mimic diacylglycerol and directly activate protein kinase C (and, as later work established, several non-PKC receptor proteins), driving sustained proliferative and inflammatory signalling. That receptor-level potency explains both the extreme irritancy and the promoting activity.
  • Teratogenicity — the Sacred Lotus record documents teratogenic effects, consistent with the absolute pregnancy contraindication.

  Stating this plainly: a constituent of this herb is the textbook experimental agent used to promote tumour formation in animal models. That is a documented laboratory fact about the compound, and it is the central reason the raw material is not used as such and why the recorded dose figure is a fraction of a gram.

  Source: PMID 4305962, DOI 10.1159/000391388 (Berenblum, tumour-promoting agents in two-stage carcinogenesis — the foundational croton-oil promotion literature); PMID 28571764, DOI 10.1016/j.semcancer.2017.04.012 (protein kinase C isoforms in tumour promotion and suppression); PMID 10820483 (phorbol-ester receptors beyond the PKC isozymes); PMID 40869036, PMC 12386474, DOI 10.3390/ijms26167714 (phorbol-ester and crotonic-acid quantification with purgative/acute-toxicity assay); PMID 35723937 (toxicology review); Sacred Lotus cautions record (teratogenicity). Toxicology reference, not a preparation or self-use instruction.

• This herb is considered toxic.
  (while some Chinese herbs are toxic, it must be noted that many come prepared, or are combined, to mitigate their toxicity)

Herb-Drug Interactions

• Does Ba Dou interact with medications?

  No systematic clinical herb–drug interaction table exists for Ba Dou, and its restricted status means the question is largely displaced by a more basic one — the substance is not used in ordinary practice at all. The documented cautions are traditional rather than pharmacokinetic: the recorded incompatibility with Qian Niu Zi, and the classical instruction against taking hot liquids alongside it.

  • Precautionary reasoning — any drastic purgative carries a general theoretical concern around fluid and electrolyte loss, which is relevant to medications sensitive to potassium status or to hydration. This is a category-level precaution, not a documented clinical interaction for this herb.
  • What is not claimed — we are aware of no verified clinical pharmacokinetic interaction studies for Ba Dou, and none are asserted here.

  Source: Sacred Lotus cautions and incompatibility records; materia medica consensus on harsh expellants. Precautionary reference only, not a documented interaction claim.

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Ba Dou (Croton tiglium)?

  Yes — and it is unusual in that the herb’s most influential contribution to modern science is to cancer research methodology rather than to therapeutics. Croton oil and its purified phorbol esters underpin the two-stage carcinogenesis model that established the distinction between tumour initiation and tumour promotion. Alongside that, a phytochemical and pharmacological literature has developed around the plant itself.

  • Phytochemistry — a 2022 comprehensive review catalogues roughly 150 identified compounds from the seeds, stems, leaves and branches, including fatty acids, terpenoids, alkaloids and plant proteins, with the tigliane diterpenoids the most intensively studied class. The same review concludes that mechanistic evidence remains insufficient and that toxicity reduction is a prerequisite for any clinical development.
  • Tumour promotion (foundational) — the two-stage model using an initiating carcinogen followed by croton oil, and the isolation of TPA/PMA from croton oil as the standard promoter, remain reference points across carcinogenesis research; TPA is still routinely used as a positive control in inflammation and promotion assays.
  • Protein kinase C signalling — phorbol esters act as diacylglycerol mimics at PKC, and later work showed additional non-PKC phorbol-ester receptors. A 2019 study isolated a novel PKC activator from Croton tiglium and examined it against non-small-cell lung cancer cells — illustrating that the same receptor pharmacology is now also probed for anti-tumour, not only tumour-promoting, effects. This is preclinical laboratory work, not clinical evidence.
  • Processing and toxicity — a 2025 analytical study quantified phorbol-12-myristate-13-acetate and crotonic acid before and after traditional processing and measured the corresponding purgative and acute-toxicity changes in rats, providing the first quantitative test of a traditional detoxification tradition for this seed.

  Clinical trial evidence for therapeutic use of Ba Dou is essentially absent. The strong, uncontested body of evidence concerns its toxicology and its role as a laboratory tumour-promoting agent.

  Sources: PMID 35723937, DOI 10.1093/jpp/rgac040 (comprehensive Croton tiglium review); PMID 4305962, DOI 10.1159/000391388 (two-stage carcinogenesis / tumour-promoting agents); PMID 28571764, DOI 10.1016/j.semcancer.2017.04.012 (PKC in tumour promotion and suppression); PMID 10820483 (non-PKC phorbol-ester receptors); PMID 31648127, DOI 10.1016/j.phymed.2019.153100 (novel PKC activator from Croton tiglium, preclinical); PMID 40869036, PMC 12386474, DOI 10.3390/ijms26167714 (processing, phorbol-ester quantification, acute toxicity). Research context only — not a therapeutic claim and not a usage instruction.

Chinese Herb Notes

• Why is Ba Dou incompatible with Qian Niu Zi, and how does it compare with other purgatives?

  Ba Dou and Qian Niu Zi (morning glory seed / pharbitis) form one of the classical “Eighteen Incompatibilities” (shi ba fan) pairings — the traditional list of herb combinations held to be mutually antagonistic and therefore never to be combined. The Sacred Lotus records this pairing explicitly, with the relationship typed as “this herb antagonizes or is antagonized by” Qian Niu Zi. It is the only incompatibility pair recorded for Ba Dou in our data.

  • The traditional reasoning — both substances are drastic purgatives, but of opposite thermal nature (Ba Dou hot, Qian Niu Zi cold). The classical objection is not simply additive strength but a doctrine of mutual antagonism, in which the pairing was held to nullify or distort both actions while compounding harm.
  • Modern reading — the incompatibility lists are a pre-modern safety heuristic rather than a pharmacological finding, and researchers have attempted to interrogate them systematically using formula co-prescription networks and chemical-space analysis. That work treats the lists as an empirical tradition worth investigating rather than as established mechanism.
  • Compared with Da Huang (rhubarb) — Da Huang is the standard purgative for heat-type accumulation and is a routine, widely used herb; Ba Dou occupies the opposite thermal pole (cold-type accumulation) and an entirely different risk class. They are not interchangeable in either direction.
  • Compared with Gan Sui, Da Ji and Yuan Hua — these are the cold, water-expelling harsh purgatives; Ba Dou is the hot one. All belong to the same restricted, toxic category, but Ba Dou is generally regarded as the most drastic of the group.

  Note on naming: the Sacred Lotus records the pharmaceutical Latin as Crotonis Fructus (the fruit) while the English common name is given as “Croton Seed.” Both forms circulate in the literature — the Chinese Pharmacopoeia entry for 巴豆 is written as Crotonis Fructus, while most Western materia medica and the research literature describe the medicinal material as the seed of Croton tiglium L. The identity fields are left unchanged pending owner review.

  Source: Sacred Lotus incompatibility record (Ba Dou / Qian Niu Zi) and linked formula records; materia medica consensus on the Eighteen Incompatibilities; PMID 24369478, DOI 10.1155/2013/352145 (systematic study of traditional Chinese medicine incompatibility using formula networks and chemical space).

This herb antagonizes or is antagonized by:

• Qian Niu Zi (Semen Pharbiditis)

This herb is considered toxic