Arnica

Research corpus coverage

Chemistry notes

• CHEMISTRY: Relevant reported constituents include helenalin sesquiterpene lactones; constituent presence alone does not establish clinical efficacy.

Traditional / historical use

Documented traditional use — not a claim of established efficacy.

• TRADITIONAL: Arnica has been used for bruises; sprains; muscle pain; this records historical/traditional use and does not establish efficacy.

  MODERATE · regulatory monograph · EMA European Union herbal monographs and list entries

Modern evidence

• EVIDENCE: For the major use set (bruises; sprains; muscle pain), the evidence assessment is limited/mixed: Limited/mixed topical trials; homeopathic evidence should not be conflated with herbal extracts.

  MODERATE · randomized controlled trial · EMA European Union herbal monographs and list entries

  Mixed findings, product heterogeneity, or indirect evidence are preserved in the detailed profile.

Forms used traditionally

A listed form does not imply it suits every plant part, or that one preparation is interchangeable with another — see the plant’s own notes below.

Cats & dogs

• High risk

  Large ingestions of Arnica montana extract may cause vomiting, diarrhea, CNS depression, muscle weakness, hypertension, and cardiotoxicity, with potentially severe cardiovascular signs.

  Intrinsic toxicity · OTHER · Arnica montana extract; concentration varies · HIGH · veterinary_manual · Toxicosis en animales por suplementos dietéticos y a base ...

• Caution

  Ingestion of Arnica montana extracts can cause vomiting, diarrhea, central nervous system depression, muscle weakness, hypertension, and cardiotoxicity; toxicity is generally mild, but product concentration and formulation vary. Highly diluted homeopathic products such as 60X or 30C HPUS are described as unlikely to cause intoxication.

  Intrinsic toxicity · OTHER · arnica extract or homeopathic formulation · HIGH · veterinary_manual · Toxicosis en animales por suplementos dietéticos y plantas ...

• Caution

  Highly diluted homeopathic arnica products labeled 60X or 30C HPUS are described as likely not to be a poisoning concern, but some products labeled homeopathic may contain low dilutions or nonstandardized or unlisted ingredients and concentrations.

  Intrinsic toxicity · OTHER · high-dilution or low-dilution homeopathic product · HIGH · veterinary_manual · Toxicoses in Animals From Human Dietary and Herbal Supplements

• Caution

  Ingestion of arnica extract can cause vomiting, diarrhea, depression, muscle weakness, hypertension, or cardiotoxicity. Arnica toxicosis is described as generally well tolerated and usually associated with mild gastrointestinal effects, but very large ingestions may be clinically important.

  Intrinsic toxicity · OTHER · Arnica montana extract; products of various strengths, including homeopathic formulations · HIGH · veterinary_manual · Toxicoses in Animals From Human Dietary and Herbal Supplements

• Low concern

  Historically highly diluted homeopathic Arnica preparations such as 60X or 30C HPUS are described as unlikely to cause toxicosis, but this does not apply to low-dilution or nonstandard products.

  Intrinsic toxicity · OTHER · highly diluted homeopathic preparation · MODERATE · veterinary_manual · Toxicosis en animales por suplementos dietéticos y a base ...

Additional safety notes (general, unstructured)

Free-text safety notes carried from their source — not broken out by species, route, or hazard type, and not equivalent to the structured records above. Each note names the kind of source it came from.

• SAFETY: Major issues include Toxic orally; contact dermatitis; cardiac/GI toxicity. Contraindications/cautions include Broken skin; Asteraceae allergy; oral use.

  HIGH · observational/case series and expert review · LiverTox: Herbal and Dietary Supplements

• SAFETY: Clinically relevant interaction concerns include Potential additive anticoagulant effects if systemically absorbed.

  MODERATE · observational/case series and expert review · LiverTox: Herbal and Dietary Supplements

  Some interactions are theoretical or based on case reports/pharmacokinetics rather than outcome trials.

• SAFETY: Pregnancy/lactation reference: Avoid in pregnancy/lactation; do not use internally.

  MODERATE · regulatory monograph or evidence synthesis · EMA European Union herbal monographs and list entries

  Absence of evidence is not evidence of safety.

• Ingestion of Arnica montana extracts can cause vomiting, diarrhea, central nervous system depression, muscle weakness, hypertension, and cardiotoxicity; toxicity is generally mild, but product concentration and formulation vary. Highly diluted homeopathic products such as 60X or 30C HPUS are described as unlikely to cause intoxication.

  HIGH · veterinary_manual · Toxicosis en animales por suplementos dietéticos y plantas ...

  Some products labeled homeopathic may contain low or nonstandard dilutions, or incompletely listed ingredients; no dog-versus-cat comparison is provided.

• Historically highly diluted homeopathic Arnica preparations such as 60X or 30C HPUS are described as unlikely to cause toxicosis, but this does not apply to low-dilution or nonstandard products.

  MODERATE · veterinary_manual · Toxicosis en animales por suplementos dietéticos y a base ...

  The qualification is limited to historically highly diluted products; labeling and concentrations may be nonstandard or undisclosed.

• Large ingestions of Arnica montana extract may cause vomiting, diarrhea, CNS depression, muscle weakness, hypertension, and cardiotoxicity, with potentially severe cardiovascular signs.

  HIGH · veterinary_manual · Toxicosis en animales por suplementos dietéticos y a base ...

  The page does not name a toxic constituent and notes substantial variability among products.

• Highly diluted homeopathic arnica products labeled 60X or 30C HPUS are described as likely not to be a poisoning concern, but some products labeled homeopathic may contain low dilutions or nonstandardized or unlisted ingredients and concentrations.

  HIGH · veterinary_manual · Toxicoses in Animals From Human Dietary and Herbal Supplements

  The page does not establish safety for all homeopathic or commercial arnica preparations.

• Ingestion of arnica extract can cause vomiting, diarrhea, depression, muscle weakness, hypertension, or cardiotoxicity. Arnica toxicosis is described as generally well tolerated and usually associated with mild gastrointestinal effects, but very large ingestions may be clinically important.

  HIGH · veterinary_manual · Toxicoses in Animals From Human Dietary and Herbal Supplements

  Cat-specific and dog-specific toxicity data are not stated.

Taxonomic identity note

• Arnica is treated here as Arnica montana L. in the family Asteraceae; recorded older names include Doronicum montanum Lam..