Sanguinarine

Sanguinarine at a Glance

Sanguinarine is a genuinely toxic red-orange benzophenanthridine alkaloid found in bloodroot (Sanguinaria canadensis), greater celandine (Chelidonium majus), plume poppy (Macleaya cordata) and other Papaveraceae. It is richest in root, latex and cell culture, and only a trace constituent of the aerial parts of Chelidonium and California poppy — an important boundary, because the subject is the isolated molecule and its cytotoxicity should not be read onto those trace-level whole-herb products ^{1,24Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 24Fedurco M et al. · 2015Modulatory effects of Eschscholzia californica alkaloids on recombinant GABAA receptorsView study →}.

Its pharmacology has real preclinical breadth — antimicrobial, anticancer and anti-inflammatory activity in cell and animal models — but the facts that define it are human ones. Sanguinarine was the active in Viadent oral-care products, which were withdrawn after being linked to oral leukoplakia ^{14Reference 14Damm DD et al. · 1999Leukoplakia of the maxillary vestibule — an association with Viadent? Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics. https://pubmed.ncbi.nlm.nih.gov/9927082/View study →}; it is the caustic principle of the corrosive “black salve” escharotics sold as folk cancer cures ^{1,20Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}; and it is the poison behind argemone-oil epidemic dropsy, a mass-poisoning syndrome with recorded deaths ^{19Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →}.

It has no approved therapeutic use. The through-line of the whole page is its toxicity: sanguinarine is cytotoxic, genotoxic, DNA-intercalating, and a cardiac Na⁺/K⁺-ATPase inhibitor, so the safety sections below are the point of the file, not an afterthought ^{2,5,20Reference 2Basu P · 2016Sanguinarine and its role in chronic diseasesView study →Reference 5Seifen E et al. · 1979Sanguinarine: a positive inotropic alkaloid which inhibits cardiac Na⁺,K⁺-ATPaseView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

The Oral Leukoplakia Story

The single most instructive episode in this molecule’s history is a cautionary tale, not a success. Through the 1980s and 1990s, a sanguinaria extract standardised to sanguinarine (plus zinc) was marketed as the active in Viadent toothpaste and mouthrinse. Controlled trials had shown modest short-term reductions in dental plaque and gingivitis ^{10,11Reference 10Kopczyk RA et al. · 1991Clinical and microbiological effects of a sanguinaria-containing mouthrinse and dentifriceView study →Reference 11Harper DS et al. · 1990Effect of 6 months’ use of a dentifrice and oral rinse containing sanguinaria extract and zinc chlorideView study →}, so the ingredient looked like a plausible botanical anti-plaque agent.

Then dentists began reporting a distinctive white lesion. Use of the sanguinaria dentifrice/rinse was epidemiologically linked to leukoplakia of the maxillary vestibule — a persistent, often long-lasting white patch of the upper gum-cheek fold, in exactly the spot where the product pooled against mucosa ^{14Reference 14Damm DD et al. · 1999Leukoplakia of the maxillary vestibule — an association with Viadent? Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics. https://pubmed.ncbi.nlm.nih.gov/9927082/View study →}. The lesion was characterised and compared against other leukoplakias, some showing dysplastic features ^{15Reference 15Eversole LR et al. · 2000Sanguinaria-associated oral leukoplakia: comparison with other benign and dysplastic leukoplakic lesionsView study →}, and the association was confirmed in matched case-control and epidemiological studies ^{16,17Reference 16Mascarenhas AK et al. · 2002ObservationalThe association between Viadent use and oral leukoplakia — results of a matched case-control studyView study →Reference 17Mascarenhas AK et al. · 2001ObservationalThe association between Viadent use and oral leukoplakiaView study →}. Because leukoplakia is a potentially premalignant oral lesion, a cosmetic-benefit oral-care product carrying a cancer-adjacent risk was untenable, and sanguinaria was removed from the product line.

The lesson generalises: a compound can produce a small, real, measurable benefit (plaque reduction) and still be the wrong thing to put on human tissue day after day. Sanguinarine’s mucosal exposure route is precisely what turned a marginal efficacy signal into a public-health withdrawal — the defining safety fact of the molecule.

Black Salve & Escharotics

Sanguinarine is also the reactive principle of “black salve” (and related “cansema”/escharotic pastes) — caustic folk remedies marketed, especially online, as home cures for skin cancers and other lesions. These preparations combine a bloodroot alkaloid extract with zinc chloride to produce an escharotic: a corrosive that kills tissue and leaves a hard black scab (eschar) ^{1,20Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

The public-safety problem is that this is indiscriminate chemical destruction, not treatment. Black salve does not distinguish tumour from healthy skin; it burns both. Documented harms include disfiguring full-thickness necrosis, destruction of the nose, ear and other facial structures, and — most dangerously — the illusion of a cure: the visible lesion sloughs away in an eschar while malignant cells persist at depth, delaying real diagnosis and treatment ^{1,20Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}. Regulators in multiple countries treat black salve as an unapproved, hazardous product, and the dermatology literature repeatedly warns against it ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

This escharotic use also sharpens the toxicology question the rest of the page answers: the same DNA-reactive, cytotoxic chemistry that makes sanguinarine caustic on skin is what underlies its genotoxicity and formally assessed carcinogenic potential ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

Sanguinarine & Chelerythrine

Sanguinarine travels with a near-twin. Chelerythrine is its sister quaternary benzophenanthridine alkaloid — the two co-occur in bloodroot, Chelidonium and Macleaya, are co-extracted commercially, and were assessed together for safety in the key toxicology studies ^{18Reference 18Kosina P et al. · 2004Sanguinarine and chelerythrine: assessment of safety on pigs in a ninety-day feeding experimentView study →}. Tellingly, sanguinarine’s own systematic name is pseudochelerythrine: the molecules are close structural relatives that share a mechanism.

What makes both reactive is the iminium (immonium) group in the alkaloid ring system. In its charged quaternary iminium form, the molecule is an electrophile that intercalates DNA and reacts with nucleophilic biomolecules — the basis of the genotoxicity flag they share ^{2,20Reference 2Basu P · 2016Sanguinarine and its role in chronic diseasesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}. Sanguinarine exists in a pH-dependent equilibrium between this reactive iminium cation (dominant at acidic/neutral pH) and a neutral alkanolamine (pseudobase) form that predominates in alkaline conditions and crosses membranes more readily ^{1Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →}. Chelerythrine behaves the same way; both also inhibit cardiac ion handling, and the pair together drives the antimicrobial, cytotoxic and pro-apoptotic activity of Papaveraceae alkaloid fractions.

They are related to, but chemically distinct from, the yellow protoberberine alkaloids that share the same plants — berberine, coptisine and protopine. Those are far better tolerated; the benzophenanthridine pair is the toxic end of the Papaveraceae alkaloid spectrum. (A dedicated chelerythrine page is not yet here — this section is the placeholder for the twin.)

What It's Used For

Sanguinarine’s preclinical activity is broad but almost entirely cytotoxic in character, and the evidence splits sharply by whether the isolated molecule — rather than a whole-herb extract — was tested. There are no efficacy trials of systemic sanguinarine.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. This is a toxic alkaloid with no approved use, so scores stay low and are dominated by the safety story. Each application links to its write-up.

01Antimicrobial / Anti-PlaqueShaky34%Human oral-care trials — but the product was withdrawn ^{10,11,21Reference 10Kopczyk RA et al. · 1991Clinical and microbiological effects of a sanguinaria-containing mouthrinse and dentifriceView study →Reference 11Harper DS et al. · 1990Effect of 6 months’ use of a dentifrice and oral rinse containing sanguinaria extract and zinc chlorideView study →Reference 21Zielińska S et al. · 2021Screening Papaveraceae as novel antibiofilm natural-based agentsView study →}

02AnticancerShaky24%In-vitro/animal apoptosis only ^{7,3Reference 7Prabhu KS et al. · 2021Sanguinarine mediated apoptosis in non-small-cell lung cancer via generation of reactive oxygen speciesView study →Reference 3Ullah A et al. · 2023Molecular mechanisms of sanguinarine in cancer prevention and treatmentView study →}

03Anti-InflammatoryShaky22%In-vitro enzyme/pathway inhibition ^{4,6Reference 4Chaturvedi MM et al. · 1997Sanguinarine (pseudochelerythrine) is a potent inhibitor of NF-κB activation, IκBα phosphorylation and degradationView study →Reference 6Vavrečková C et al. · 1996Benzophenanthridine alkaloids of Chelidonium majus; I: inhibition of 5- and 12-lipoxygenase by a non-redox mechanismView study →}

04AntifungalShaky18%In-vitro against Candida ^{9Reference 9Hu Z et al. · 2022Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesisView study →}

Mechanisms

Pharmacokinetics

Poor oral bioavailability and rapid clearance are load-bearing. In rats, orally dosed sanguinarine is poorly absorbed, widely distributed and rapidly eliminated, largely as the reduced metabolite dihydrosanguinarine ^{8Reference 8Vecera R et al. · 2007AnimalDisposition of sanguinarine in the ratView study →}. This poor systemic exposure is a major reason its striking in-vitro anticancer potency has never translated — the concentrations that kill tumour cells in a dish are not reached in plasma from any tolerable oral exposure ^{3,8Reference 3Ullah A et al. · 2023Molecular mechanisms of sanguinarine in cancer prevention and treatmentView study →Reference 8Vecera R et al. · 2007AnimalDisposition of sanguinarine in the ratView study →}.

Sanguinarine also exists in a pH-dependent equilibrium between the charged iminium (quaternary) form — dominant and DNA-reactive at acidic/neutral pH — and the neutral alkanolamine (pseudobase) form that predominates in alkaline conditions and crosses membranes more readily ^{1Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →}. This equilibrium governs both cellular uptake and reactivity, so “sanguinarine exposure” is really exposure to a mixture whose ratio shifts with local pH.

Clinical Trials

The only substantial human exposure is oral care: sanguinaria/sanguinarine-plus-zinc dentifrice and mouthrinse (Viadent). Controlled trials reported modest short-term plaque and gingivitis reductions ^{10,11Reference 10Kopczyk RA et al. · 1991Clinical and microbiological effects of a sanguinaria-containing mouthrinse and dentifriceView study →Reference 11Harper DS et al. · 1990Effect of 6 months’ use of a dentifrice and oral rinse containing sanguinaria extract and zinc chlorideView study →}, including after scaling and root planing ^{12Reference 12Tenenbaum H et al. · 1999Effectiveness of a sanguinarine regimen after scaling and root planingView study →}, but reviews of chemical plaque-control agents rank the effect as small and inconsistent ^{13Reference 13Paraskevas S et al. · 2005RCTRandomised controlled clinical trials on agents used for chemical plaque controlView study →}. There are no oncology, anti-inflammatory or antimicrobial clinical trials of systemic sanguinarine — and the Viadent history is a cautionary tale, not a success.

Last checked: July 2026.

Isolate vs. Plant Studies

The evidence base is unusually clean on one axis and treacherous on another. The anticancer, anti-inflammatory and antifungal work is overwhelmingly the isolated molecule — sanguinarine itself, in cell and animal models ^{4,6,7,9Reference 4Chaturvedi MM et al. · 1997Sanguinarine (pseudochelerythrine) is a potent inhibitor of NF-κB activation, IκBα phosphorylation and degradationView study →Reference 6Vavrečková C et al. · 1996Benzophenanthridine alkaloids of Chelidonium majus; I: inhibition of 5- and 12-lipoxygenase by a non-redox mechanismView study →Reference 7Prabhu KS et al. · 2021Sanguinarine mediated apoptosis in non-small-cell lung cancer via generation of reactive oxygen speciesView study →Reference 9Hu Z et al. · 2022Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesisView study →} — so those mechanistic findings genuinely belong to the compound. The human data, by contrast, come from a standardised sanguinaria extract (Viadent), not pure sanguinarine ^{10,11,14Reference 10Kopczyk RA et al. · 1991Clinical and microbiological effects of a sanguinaria-containing mouthrinse and dentifriceView study →Reference 11Harper DS et al. · 1990Effect of 6 months’ use of a dentifrice and oral rinse containing sanguinaria extract and zinc chlorideView study →Reference 14Damm DD et al. · 1999Leukoplakia of the maxillary vestibule — an association with Viadent? Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics. https://pubmed.ncbi.nlm.nih.gov/9927082/View study →}.

The treacherous direction is the reverse import. The plants that carry sanguinarine as a trace aerial constituent — Chelidonium and California poppy — are used as low-alkaloid whole-herb teas and tinctures, where sanguinarine is present at fractions of a percent of the alkaloid load and the drunk preparation is dominated by gentler alkaloids ^{1,24Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 24Fedurco M et al. · 2015Modulatory effects of Eschscholzia californica alkaloids on recombinant GABAA receptorsView study →}. The isolate’s cytotoxicity must not be read onto those products: the aerial-part exposure is not the cell-culture exposure. The genuinely alkaloid-dense tissues are bloodroot rhizome, latex and cell culture — the materials behind the black-salve and epidemic-dropsy harms.

Prevalence in Nature

Sanguinarine is a Papaveraceae (poppy-family) alkaloid, biosynthesised from the benzylisoquinoline pathway and concentrated in specific tissues rather than spread evenly through the plant. Its richest natural sources are bloodroot (Sanguinaria canadensis) rhizome and plume poppy (Macleaya cordata), both used commercially as sanguinarine sources ^{1,9Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 9Hu Z et al. · 2022Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesisView study →}.

In greater celandine (Chelidonium majus) it is one of several benzophenanthridines: the alkaloid-densest tissue is the latex, where benzophenanthridines (chelidonine + sanguinarine + coptisine) make up roughly 20% of the fresh latex, while a 25%-ethanol herb extract of the aerial parts carried only about 0.22 mg/g sanguinarine — far less than the more abundant coptisine and chelidonine ^{23,22Reference 23Gilca M et al. · 2010ReviewChelidonium majus — an integrative review: traditional knowledge versus modern findingsView study →Reference 22Orvos P et al. · 2015Effects of Chelidonium majus extracts and major alkaloids on hERG potassium channels and on dog cardiac action potential — a safety approachView study →}. In California poppy (Eschscholzia californica) sanguinarine and chelerythrine are trace in the aerial parts but accumulate in root and cell culture, so the drunk/tinctured aerial product carries very little ^{24Reference 24Fedurco M et al. · 2015Modulatory effects of Eschscholzia californica alkaloids on recombinant GABAA receptorsView study →}.

Across all these plants the absolute content swings several-fold with plant part (root/latex ≫ aerial), ecotype, developmental stage and season ^{23Reference 23Gilca M et al. · 2010ReviewChelidonium majus — an integrative review: traditional knowledge versus modern findingsView study →}, and it is the root, latex and cell-culture materials — not the leaf teas — that concentrate the molecule.

Major Natural Sources

Source	Plant part	Sanguinarine level
Bloodroot (Sanguinaria canadensis)	rhizome	Rich — primary commercial source 1Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →
Plume poppy (Macleaya cordata)	whole plant / extract	Rich — commercial isolation source 9Reference 9Hu Z et al. · 2022Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesisView study →
Greater celandine (Chelidonium majus)	latex	High (benzophenanthridines ~20% of fresh latex) 23Reference 23Gilca M et al. · 2010ReviewChelidonium majus — an integrative review: traditional knowledge versus modern findingsView study →
Greater celandine (Chelidonium majus)	aerial parts	Minor (~0.22 mg/g of a 25% EtOH extract) 22Reference 22Orvos P et al. · 2015Effects of Chelidonium majus extracts and major alkaloids on hERG potassium channels and on dog cardiac action potential — a safety approachView study →
California poppy (Eschscholzia californica)	aerial parts	Trace (accumulates in root/cell culture) 24Reference 24Fedurco M et al. · 2015Modulatory effects of Eschscholzia californica alkaloids on recombinant GABAA receptorsView study →
Mexican prickly poppy (Argemone mexicana)	seed oil	Present — the epidemic-dropsy adulterant 19Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →

Comparable single-molecule percent-dry-weight figures for bloodroot and Macleaya are not consistently reported in the sources reviewed here; those quantitative holes are logged in the compound’s gaps tracker.

Discovery & Synthesis

Sanguinarine was first isolated in the 19th century from bloodroot (Sanguinaria canadensis) — the plant, the alkaloid and the vivid red-orange colour all take their name from the same root (sanguis, blood; the rhizome bleeds a red-orange latex) ^{1Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →}. Its systematic relationship to its twin is preserved in its alternate name, pseudochelerythrine ^{4Reference 4Chaturvedi MM et al. · 1997Sanguinarine (pseudochelerythrine) is a potent inhibitor of NF-κB activation, IκBα phosphorylation and degradationView study →}.

Manufacture today is by extraction from plant material, not total synthesis: sanguinarine (and chelerythrine) are obtained commercially from plume poppy (Macleaya cordata) and bloodroot, where they occur at workable concentrations — this is the practical route for the research-reagent and (formerly) oral-care and veterinary-feed-additive supply ^{1,9Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 9Hu Z et al. · 2022Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesisView study →}. There is no industrial-scale total-synthesis route competing with extraction, because the molecule is a niche toxic reagent, not a bulk drug.

Patents: not yet researched.

Toxicity & Safety

Sanguinarine is genuinely toxic — the safety section is the point. It is cytotoxic, genotoxic and DNA-intercalating; it is the poison behind a named human syndrome (epidemic dropsy); the one product that put it on human mucosa was withdrawn over leukoplakia; and it is the caustic principle of black salve. The [toxic] badge is chosen deliberately: the harms are dose-dependent and largely from concentrated exposures (adulterated oil, escharotic paste, standardised mucosal products), which places it above a moderate phenolic but short of a poisonous single-dose-lethal alkaloid — and its carcinogenic potential is formally assessed but not a classified carcinogen rating ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

Safety at a Glance

☠️ ToxicCardiac cautionCardiac risk

• A toxic, genotoxic alkaloid. DNA-intercalating via its reactive iminium form, with a formally assessed carcinogenic-potential concern — not a benign botanical ^{2,20Reference 2Basu P · 2016Sanguinarine and its role in chronic diseasesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.
• Causes epidemic dropsy. Argemone-oil adulteration of mustard oil produces edema, glaucoma and cardiovascular/respiratory failure, with deaths in outbreaks ^{19Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →}.
• Linked to oral leukoplakia. Repeated mucosal exposure from Viadent dentifrice was associated with a persistent, potentially premalignant lesion; the product was withdrawn ^{14Reference 14Damm DD et al. · 1999Leukoplakia of the maxillary vestibule — an association with Viadent? Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics. https://pubmed.ncbi.nlm.nih.gov/9927082/View study →}.
• Caustic in “black salve.” The escharotic principle of quack skin-cancer pastes — indiscriminate tissue necrosis that can mask, not cure, malignancy ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.
• Cardiac Na⁺/K⁺-ATPase inhibition and hERG block. A positive inotrope that also prolongs cardiac repolarisation; a 90-day pig study defined only low no-adverse-effect exposures ^{5,18,22Reference 5Seifen E et al. · 1979Sanguinarine: a positive inotropic alkaloid which inhibits cardiac Na⁺,K⁺-ATPaseView study →Reference 18Kosina P et al. · 2004Sanguinarine and chelerythrine: assessment of safety on pigs in a ninety-day feeding experimentView study →Reference 22Orvos P et al. · 2015Effects of Chelidonium majus extracts and major alkaloids on hERG potassium channels and on dog cardiac action potential — a safety approachView study →}.
• This is the isolated molecule. Aerial parts of Chelidonium and California poppy carry only trace sanguinarine — do not read this cytotoxicity onto those whole-herb products ^{1,24Reference 1Croaker A et al. · 2016Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current usesView study →Reference 24Fedurco M et al. · 2015Modulatory effects of Eschscholzia californica alkaloids on recombinant GABAA receptorsView study →}.

Epidemic Dropsy

Sanguinarine is the principal toxin in argemone (Argemone mexicana) oil, a notorious adulterant of edible mustard oil in South Asia. Ingestion of the contaminated oil causes epidemic dropsy — bilateral pitting edema, glaucoma, and cardiovascular and respiratory failure, with deaths in outbreak settings — a serious systemic poisoning attributed to sanguinarine’s vascular permeability and Na⁺/K⁺-ATPase effects ^{19Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →}. This is the clearest evidence that sanguinarine is a real human poison, not merely a cytotoxic laboratory curiosity.

Cardiac Effects

Sanguinarine is a positive inotropic alkaloid that inhibits cardiac Na⁺/K⁺-ATPase ^{5Reference 5Seifen E et al. · 1979Sanguinarine: a positive inotropic alkaloid which inhibits cardiac Na⁺,K⁺-ATPaseView study →} — the same class of action as cardiac glycosides, and the mechanism behind the cardiovascular collapse of epidemic dropsy. Its benzophenanthridine relatives (including chelerythrine) also block the hERG (IKr) potassium channel, prolonging cardiac repolarisation and raising an arrhythmia-risk flag for the alkaloid class ^{22Reference 22Orvos P et al. · 2015Effects of Chelidonium majus extracts and major alkaloids on hERG potassium channels and on dog cardiac action potential — a safety approachView study →}. A 90-day feeding study in pigs of the sanguinarine/chelerythrine pair defined only relatively low no-adverse-effect exposures, underscoring a narrow safety margin ^{18Reference 18Kosina P et al. · 2004Sanguinarine and chelerythrine: assessment of safety on pigs in a ninety-day feeding experimentView study →}.

Genotoxicity & Carcinogenic Potential

Sanguinarine’s reactive iminium form intercalates DNA and forms adducts, and it registers genotoxic signals in assay systems ^{2,20Reference 2Basu P · 2016Sanguinarine and its role in chronic diseasesView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}. Because it was used both on mucosa (mouthwash) and on skin (“therapeutic” black salve), its carcinogenic potential has been formally assessed — a review specifically framed around the black-salve and mouthwash uses concluded the genotoxic profile is a real concern that argues against those uses ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}. It is not (yet) a classified human carcinogen, but the direction of the evidence is unfavourable, and the oral-leukoplakia epidemiology sits alongside it.

Reproductive & Developmental Note

There are no adequate reproductive- or developmental-safety data for isolated sanguinarine, and a cytotoxic, genotoxic, DNA-intercalating alkaloid with documented systemic poisoning is one for which the absence of data cannot be read as safety. Any use in pregnancy or lactation is unwarranted on the toxicology alone. Per this site’s convention, the pregnancy/lactation verdict is made on the relevant herb or product page (where intake is actually decided), not on this molecule page — but the toxicological posture here is plainly cautionary ^{2,19,20Reference 2Basu P · 2016Sanguinarine and its role in chronic diseasesView study →Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}.

Dosage

There is no established therapeutic dose, and none should be inferred. Historical human exposure was topical/oral-care — Viadent dentifrice and rinse at roughly 0.03% sanguinaria extract, which was withdrawn over leukoplakia ^{14Reference 14Damm DD et al. · 1999Leukoplakia of the maxillary vestibule — an association with Viadent? Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontics. https://pubmed.ncbi.nlm.nih.gov/9927082/View study →}. The other main human data point is harmful: argemone-oil adulteration of edible oil causing epidemic dropsy ^{19Reference 19Das M · 1997ObservationalClinicoepidemiological, toxicological and safety evaluation studies on argemone oilView study →}. “Black salve” applies an undefined, caustic dose directly to skin and is a hazard, not a therapy ^{20Reference 20Croaker A et al. · 2017Carcinogenic potential of sanguinarine, a phytochemical used in “therapeutic” black salve and mouthwashView study →}. This section is framed by toxic exposures, not a dosing schedule — there is no safe self-dose of isolated sanguinarine.

References

1. Croaker A, et al. (2016). Sanguinaria canadensis: traditional medicine, phytochemical composition, biological activities and current uses. International Journal of Molecular Sciences. https://pubmed.ncbi.nlm.nih.gov/27618894/
2. Basu P, Kumar GS (2016). Sanguinarine and its role in chronic diseases. Advances in Experimental Medicine and Biology. https://pubmed.ncbi.nlm.nih.gov/27671816/
3. Ullah A, et al. (2023). Molecular mechanisms of sanguinarine in cancer prevention and treatment. Anti-Cancer Agents in Medicinal Chemistry. https://pubmed.ncbi.nlm.nih.gov/36045531/
4. Chaturvedi MM, et al. (1997). Sanguinarine (pseudochelerythrine) is a potent inhibitor of NF-κB activation, IκBα phosphorylation and degradation. Journal of Biological Chemistry. https://pubmed.ncbi.nlm.nih.gov/9374492/
5. Seifen E, et al. (1979). Sanguinarine: a positive inotropic alkaloid which inhibits cardiac Na⁺,K⁺-ATPase. European Journal of Pharmacology. https://pubmed.ncbi.nlm.nih.gov/230984/
6. Vavrečková C, et al. (1996). Benzophenanthridine alkaloids of Chelidonium majus; I: inhibition of 5- and 12-lipoxygenase by a non-redox mechanism. Planta Medica. https://pubmed.ncbi.nlm.nih.gov/9005450/
7. Prabhu KS, et al. (2021). Sanguinarine mediated apoptosis in non-small-cell lung cancer via generation of reactive oxygen species. Biomedicine & Pharmacotherapy. https://pubmed.ncbi.nlm.nih.gov/34794241/
8. Vecera R, et al. (2007). Disposition of sanguinarine in the rat. Xenobiotica. https://pubmed.ncbi.nlm.nih.gov/17523056/
9. Hu Z, et al. (2022). Sanguinarine, isolated from Macleaya cordata, exhibits potent antifungal efficacy against Candida albicans through inhibiting ergosterol synthesis. Frontiers in Microbiology. https://pubmed.ncbi.nlm.nih.gov/35783394/
10. Kopczyk RA, et al. (1991). Clinical and microbiological effects of a sanguinaria-containing mouthrinse and dentifrice. Journal of Periodontology. https://pubmed.ncbi.nlm.nih.gov/1770421/
11. Harper DS, et al. (1990). Effect of 6 months’ use of a dentifrice and oral rinse containing sanguinaria extract and zinc chloride. Journal of Periodontology. https://pubmed.ncbi.nlm.nih.gov/2195153/
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