Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

Arnica Ingredients & Drug Interactions

by Herb Pharm

Arnica label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Arnica against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Arnica is a dietary supplement by Herb Pharm with 1 active ingredient. Its ingredients are commonly taken for bruising, muscle soreness, joint pain (osteoarthritis).Based on those ingredients, 122 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Arnica flower (Arnica montana) extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Arnica by Herb Pharm

Ask about any prescription or over-the-counter medication and we check it for interactions with Arnica by Herb Pharm — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
Prefer a human? Send your question to our licensed pharmacists — free, answered by email within 24 hours.

HelloPharmacist Scorecard of Arnica by Herb Pharm

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 16, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

Herb Pharm Arnica contains one active ingredient: arnica flower extract. The product also includes certified organic alcohol and distilled water as inactive ingredients (preservative and solvent).

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: bruising, soreness, swelling, minor injury.
  • We looked for evidence on: Bruises, Exercise-induced muscle soreness, Osteoarthritis, Postoperative pain, Postoperative recovery, Postoperative swelling — and 4 related terms.
  • The strongest evidence on file: Arnica is rated "Possibly Effective" for Osteoarthritis (Natural Medicines).
  • Also on file: Arnica is rated "Insufficient Reliable Evidence To Rate" for Exercise-induced muscle soreness, Postoperative pain, Bruises, Postoperative recovery, and more.

The evidence supports arnica for osteoarthritis — it's rated possibly effective for joint pain. For acne, breast cancer-related hot flashes, postoperative pain, and dry eye, the evidence isn't established in the data we hold, so we can't say whether it works for those uses.

The evidence, ingredient by ingredient Arnica

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Arnica liquid is meant for topical use or homeopathic dilution — never swallow undiluted arnica, as it's unsafe by mouth and can cause serious toxicity. Topical and properly diluted homeopathic arnica are generally well tolerated; topical use may occasionally cause contact dermatitis or skin irritation.

If taken by mouth undiluted, arnica can cause bleeding, nausea, vomiting, high blood pressure, muscle weakness, shortness of breath, and in rare cases arrhythmia, coma, or organ failure. There isn't enough safety data to use arnica during pregnancy or while breastfeeding.

If you're pregnant, nursing, or planning to become pregnant, talk with your doctor or pharmacist before using this product.

Side effects, ingredient by ingredient Arnica

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Arnica.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 122 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your doctor or pharmacist before using this product if you take blood thinners or antiplatelet drugs (such as warfarin, aspirin, or clopidogrel). In theory, arnica could add to their blood-thinning effect, though this hasn't been confirmed in people.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Herb Pharm Arnica may help with osteoarthritis when used topically or as a homeopathic dilution. If you take blood thinners or antiplatelet drugs, you'll need to check with your doctor or pharmacist first — the product could theoretically add to their effect.

Never swallow this liquid undiluted, and avoid it in pregnancy and while nursing without medical guidance.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Feb 25, 2015.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Arnica, straight from the product label.

Brand Herb Pharm
Barcode (UPC) 090700000042
Net contents 1 fl. Oz.; 30 mL
Market status On market
Date entered into DSLD Feb 25, 2015
DSLD ID 42611
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), Organic, Gluten Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Arnica by Herb Pharm, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
0.22 mL
Maximum serving Sizes:
0.22 mL
Servings per container
135
UPC/BARCODE
090700000042
IngredientAmount% DV
Arnica flower (Arnica montana) extract194 mg--

Other ingredients: certified organic Alcohol, distilled Water

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formulation

We prepare our Arnica Extract from the whole flowers of Arnica montana plants which are Certified Organically Grown and/or Sustainably Wildcrafted in their natural, high mountain habitat.

We never use synthetic solvents like hexane, methanol and petroleum ether. And, we don't add unnecessary binders, fillers, colors or preservatives.

GLUTEN-FREE

General Statements

A Heritage of Purity & Potency For over 30 years Herb Pharm has earned our customers' trust by making pure and potent botanical medicines. We've always understood that the integrity of our products directly affects your health and vitality. Our extracts capture the flavor, aroma and broad-spectrum medicinal profile of the original plant, and we don't spike our products or otherwise meddle in Nature's intentional balance. Our herbs must pass therapeutic profile analysis, sensory and macroscopic evaluation, as well as pesticide, herbicide, allergen, heavy metal and microbiological screening. We use only clean ingredients.

For consistently safe and effective healing herbs, Herb Pharm has always been the gold standard.

whole flower

Peel back label for important cautionary statements & more information.

PEEL HERE

NERVOUS SYSTEM Minor Pain

Precautions

Caution: Do not use during pregnancy, if trying to become pregnant or during nursing.

Consult expert medical advice before using in children under 15 years of age, asthmatics, the aged and severely weakened individuals.

Consult expert medical advice before using in children under 15 years of age, asthmatics, the aged and severely weakened individuals.

Do not exceed recommended dose and limit internal use to two consecutive weeks followed by a two week break. Do not use on broken or abraded skin. Discontinue use if irritation appears on skin or in mouth, throat or stomach. Prolonged topical use of use on broken skin may cause skin irritation. Do not use if seal is broken or missing.

Keep Out of the Reach of Children

Storage

Keep bottle tightly closed and store away from heat & light.

Store away from heat & light

Formula

Arnica Liquid Extract

Dry herb/menstruum ratio: 1:10

Brand IP Statement(s)

Label Patent #7,601,410

Suggested/Recommended/Usage/Directions

SUGGESTED USE Shake Well Before Using Internal: Take up to 10 drops in 8 oz. of water or juice, 1 to 3 times per day. Best taken between meals. Topical: One to three times per day gently rub a small amount into the affected area until well absorbed.

General

012

FDA Statement of Identity

HERBAL SUPPLEMENT

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Arnica by Herb Pharm label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Arnica label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Arnica by Herb Pharm

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size0.22 mL Dosage formLiquid Servings per container135 Amounts shown are per serving.

Arnica flower (Arnica montana) extract

Interacts with
122 drugs
194 mg per serving

Arnica is a daisy-family plant used mainly in topical and homeopathic products for bruising, muscle soreness, and pain. The evidence is mixed and most...

Arnica flower (Arnica montana) extract monograph & interactions

Other (inactive) ingredients: Certified organic Alcohol, Distilled Water. These complete the product’s ingredient list but are not active constituents.

Interaction report

Arnica by Herb Pharm Drug Interactions

Want to check YOUR meds against Arnica?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
122Drugs
122 Moderate

Ingredients driving the most interactions

Arnica flower (Arnica montana) extract 122

Individual Drug Interactions

The ingredients in Arnica interact with 122 drugs. Click any drug to see the details.

1 of the 1 ingredient in Arnica interact with drugs. Each result below shows which ingredient is responsible. Arnica flower (Arnica montana) extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Arnica with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Arnica flower (Arnica montana) extract1 drug type · 122 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, arnica might have additive effects with anticoagulant and antiplatelet drugs. Homeopathic arnica preparations are unlikely to have this interaction.
In vitro evidence shows that sesquiterpene lactones in arnica flowers can decrease platelet aggregation. However, this effect has not been reported in humans.

Likelihood Unlikely Evidence D
Arnica flower (Arnica montana) extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Arnica, from the product label.

Herb Pharm

See all Herb Pharm products
Name
Herb Pharm
City
Williams
State
OR
ZipCode
97544
Phone Number
800-348-4372
Web Address
www.herb-pharm.com
Pharmacist Counseling Corner

Arnica by Herb Pharm: Common Questions

Does Arnica by Herb Pharm interact with any medications?
Yes. Based on its ingredients, Arnica has a known interaction with 122 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Arnica contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I use Herb Pharm Arnica if I'm pregnant or breastfeeding?
No — there isn't enough safety data. The facts advise against it during pregnancy and while breastfeeding. Talk with your doctor or pharmacist for personalized advice before using arnica if you're pregnant, nursing, or planning to become pregnant.
Can I swallow this arnica liquid straight?
No — undiluted arnica should never be swallowed. It's unsafe by mouth and can cause serious toxicity, including bleeding, nausea, high blood pressure, and in rare cases arrhythmia or organ failure. Use it topically or as a proper homeopathic dilution only.
What is arnica supposed to help with?
Arnica is possibly effective for osteoarthritis. For acne, hot flashes, pain after surgery, and dry eye, the evidence isn't established, so we can't say whether it works for those.
Is topical arnica safe?
Yes — topical arnica is generally well tolerated. Occasionally it may cause contact dermatitis or skin irritation, but these are not common.
What's in this product besides the arnica?
The liquid contains certified organic alcohol and distilled water, which act as preservative and solvent.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Arnica is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Arnica label
Go deeper

The Full Monographs Behind Arnica’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Arnica

Interacts with 122 drugs

Arnica is a daisy-family plant used mainly in topical and homeopathic products for bruising, muscle soreness, and pain. The evidence is mixed and mostly weak, and undiluted arnica taken by m...

Read the full Arnica monograph →
Sources

Sources & How We Checked

Arnica's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 10 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Arnica 10 references
  1. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  2. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  3. Schroder H, Losche W, Strobach H, et al. Helenalin and 11 alpha, 13-dihydrohelenalin, two constituents from Arnica montana L., inhibit human platelet function via thiol-dependent pathways. Thromb Res 1990;57:839-45.
  4. Adkison JD, Bauer DW, Chang T. The effect of topical arnica on muscle pain. Ann Pharmacother 2010;44:1579-84. PubMed
  5. No authors listed. Final report on the safety assessment of Arnica montana extract and Arnica montana. Int.J.Toxicol. 2001;20:1-11. DOI
  6. Karow JH, Abt HP, Frohling M, and Ackermann H. Efficacy of Arnica montana D4 for healing of wounds after Hallux valgus surgery compared to diclofenac. J Altern Complement Med 2008;14:17-25.
  7. Venkatramani DV, Goel S, Ratra V, et al. Toxic optic neuropathy following ingestion of homeopathic medication Arnica-30. Cutan.Ocul.Toxicol. 2013;32:95-97. PubMed
  8. Moghadam BK, Gier R, and Thurlow T. Extensive oral mucosal ulcerations caused by misuse of a commercial mouthwash. Cutis 1999;64:131-134.
  9. Stevinson C, Devaraj VS, Fountain-Barber A, et al. Homeopathic arnica for prevention of pain and bruising: randomized placebo-controlled trial in hand surgery. J R Soc Med 2003;96:60-65. PubMed
  10. Canders CP, Stanford SR, Chiem AT. A dangerous cup of tea. Wilderness Environ Med. 2014 Mar;25(1):111-2. PubMed

See these in context on the Arnica monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Supplement interaction checker › Check any supplement or product against your medications Drug–drug interactions › Check two or more of your medications against each other Browse medications A–Z › Every drug we've checked against herbs & supplements NDC & pricing lookup › Find a drug’s NDCs, packaging and costs Ask a pharmacist › Free, personal answer from our licensed team