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Dietary supplement

Pau d'Arco Ingredients & Drug Interactions

by Herb Pharm Professional

Pau d'Arco label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Pau d'Arco 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

Pau d'Arco is a dietary supplement by Herb Pharm Professional with 1 active ingredient. Its ingredients are commonly taken for infections (bacterial, fungal, yeast), inflammation, immune support.Based on those ingredients, 122 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Pau d'Arco inner bark (Handroanthus impetiginosus) extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Pau d'Arco by Herb Pharm Professional

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

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HelloPharmacist Scorecard of Pau d'Arco by Herb Pharm Professional

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 Sep 3, 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.

This product contains a single active ingredient: pau d'arco inner bark extract from Handroanthus impetiginosus. The extract is prepared in a base of distilled water, certified organic cane alcohol, and certified organic vegetable glycerin to preserve and deliver the herb.

Does it work?

Couldn't assess
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
Not assessable

This is a single-ingredient Pau D'arco product and its label doesn't state a use — see Pau D'arco's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence for pau d'arco is not well established. The data we hold shows insufficient reliable evidence to rate it for cancer, peptic ulcers, wound healing, or dysmenorrhea — meaning there isn't enough solid research to say whether it actually works for these uses.

Before relying on it for any health concern, talk with your doctor about what the evidence actually supports.

The evidence, ingredient by ingredient Pau D'arco

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.

Pau d'arco is generally well tolerated at typical doses, but human safety data is limited and side effects may occur at higher doses. The lapachol compound in pau d'arco, when taken in doses above 1.5 grams daily, may cause anemia (low red blood cell count), increased bleeding risk, severe nausea, vomiting, and diarrhea.

Additionally, occupational exposure to pau d'arco sawdust can trigger asthma and skin inflammation — though this applies mainly to workers handling the wood rather than people taking the herb by mouth. During pregnancy, the safety data advises against use due to the risk of harm to the developing baby and lack of reliable safety information.

There isn't enough data to know whether pau d'arco is safe while breastfeeding — talk with your doctor or pharmacist for personalized advice if you're nursing.

Side effects, ingredient by ingredient Pau D'arco

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 — Pau D'arco.
  • 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.

Before taking Pau d'Arco, double-check any blood thinners or antiplatelet drugs you're on — such as warfarin, aspirin, or clopidogrel. Pau d'arco may increase your bleeding risk when taken together with these medications.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Pau d'Arco is a single-ingredient herb extract with limited evidence for the health claims often made about it. The main caution is with blood-thinning medications — the interaction risk is real enough that you should check with your doctor or pharmacist before combining them.

Avoid it during pregnancy, and don't use it while breastfeeding without guidance from your healthcare provider.

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, 2019.

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 Pau d'Arco, straight from the product label.

Brand Herb Pharm Professional
Barcode (UPC) 090700029197
Net contents 2 fl. Oz.; 60 mL
Market status On market
Date entered into DSLD Feb 25, 2019
DSLD ID 199957
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), 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 Pau d'Arco by Herb Pharm Professional, 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:
0.7 mL
Maximum serving Sizes:
0.7 mL
Servings per container
84
UPC/BARCODE
090700029197
IngredientAmount% DV
Pau d'Arco inner bark (Handroanthus impetiginosus) extract704 mg--

Other ingredients: distilled Water, certified organic Cane Alcohol, certified organic Vegetable Glycerin

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.
Suggested/Recommended/Usage/Directions

Suggested use Shake well before using Add 1 full squeeze of the dropper bulb to 2 oz. of water or juice, 2 to 4 times per day. Best taken between meals. Practitioner may increase dosage if desired.

Precautions

Keep out of the reach of children

Storage

Store away from heat & light

General

002

Formula

Handroanthus impetiginosus

Pau d'Arco liquid extract (Lapacho - Taheebo)

We prepare our Pau d'Arco extract from the inner bark of purple-flowered responsibly wildcrafted Handroanthus impetiginosus trees.

FDA Statement of Identity

Herbal Supplement

Formulation

Gluten-free

General Statements

Dry herb / menstruum ratio: 1:4

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

See for yourself

Pau d'Arco by Herb Pharm Professional label

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

Pau d'Arco 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 Pau d'Arco by Herb Pharm Professional

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

Serving size0.7 mL Dosage formLiquid Servings per container84 Amounts shown are per serving.

Pau d'Arco inner bark (Handroanthus impetiginosus) extract

Interacts with
122 drugs
704 mg per serving

Pau d'arco is a South American tree bark traditionally used for infections and inflammation, and it contains compounds like lapachol that show activit...

Pau d'Arco inner bark (Handroanthus impetiginosus) extract monograph & interactions

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

Interaction report

Pau d'Arco by Herb Pharm Professional Drug Interactions

Want to check YOUR meds against Pau d'Arco?

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

Pau d'Arco inner bark (Handroanthus impetiginosus) extract 122

Individual Drug Interactions

The ingredients in Pau d'Arco interact with 122 drugs. Click any drug to see the details.

1 of the 1 ingredient in Pau d'Arco interact with drugs. Each result below shows which ingredient is responsible. Pau d'Arco inner bark (Handroanthus impetiginosus) extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Pau d'Arco 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.

Pau d'Arco inner bark (Handroanthus impetiginosus) extract1 drug type · 122 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, pau d'arco might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
In vitro research shows that pau d'arco reduces platelet aggregation and may interfere with vitamin K. One clinical study shows that taking the lapachol constituent of pau d'arco in doses above 1.5 grams daily increases the risk of bleeding. The effects of whole pau d'arco or pau d'arco extract in humans are unclear.

Likelihood Possible Evidence D
Pau d'Arco inner bark (Handroanthus impetiginosus) extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Pau d'Arco, from the product label.

Herb Pharm Professional

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

Pau d'Arco by Herb Pharm Professional: Common Questions

Does Pau d'Arco by Herb Pharm Professional interact with any medications?
Yes. Based on its ingredients, Pau d'Arco 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?
Pau d'Arco 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 take this if I'm pregnant or breastfeeding?
No — the safety data advises against pau d'arco during pregnancy because of potential harm to the developing baby. If you're breastfeeding, there isn't enough safety information available, so talk with your doctor or pharmacist before using it.
What is lapachol, and why does it matter?
Lapachol is a compound found naturally in pau d'arco. At higher doses (above 1.5 grams daily), lapachol can cause anemia, bleeding problems, severe nausea, vomiting, and diarrhea — so staying within recommended doses is important.
Does this product actually work for cancer, ulcers, or other conditions?
The evidence isn't established in our data. For cancer, peptic ulcers, wound healing, and dysmenorrhea, we have insufficient reliable evidence to rate whether pau d'arco works — meaning there isn't solid research backing those uses yet.
What are the inactive ingredients?
This liquid extract contains distilled water, certified organic cane alcohol, and certified organic vegetable glycerin as the base — these help preserve and deliver the active pau d'arco extract.
Could this cause side effects on its own?
At typical doses, pau d'arco is generally well tolerated, but human safety data is limited. At higher doses, it may cause nausea, vomiting, diarrhea, or anemia — so stick to the recommended dose and talk with your pharmacist if you have concerns.

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

Not sure if Pau d'Arco is safe with your meds?

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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.

Pau d'Arco label
Go deeper

The Full Monographs Behind Pau d'Arco’s Ingredients

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

Herb & supplement monograph

Pau D'arco

Interacts with 122 drugs

Pau d'arco is a South American tree bark traditionally used for infections and inflammation, and it contains compounds like lapachol that show activity in lab studies. However, strong human...

Read the full Pau D'arco monograph →
Sources

Sources & How We Checked

Pau d'Arco'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 6 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.

Pau D'arco 6 references
  1. Gómez Castellanos JR, Prieto JM, Heinrich M. Red Lapacho (Tabebuia impetiginosa)--a global ethnopharmacological commodity? J Ethnopharmacol 2009;121:1-13. PubMed
  2. Guerra, Mde O., Mazoni, A. S., Brandao, M. A., and Peters, V. M. Toxicology of Lapachol in rats: embryolethality. Braz.J Biol. 2001;61(1):171-174. PubMed
  3. Felicio, A. C., Chang, C. V., Brandao, M. A., Peters, V. M., and Guerra, Mde O. Fetal growth in rats treated with lapachol. Contraception 2002;66(4):289-293. PubMed
  4. Son, D. J., Lim, Y., Park, Y. H., Chang, S. K., Yun, Y. P., Hong, J. T., Takeoka, G. R., Lee, K. G., Lee, S. E., Kim, M. R., Kim, J. H., and Park, B. S. Inhibitory effects of Tabebuia impetiginosa inner bark extract on platelet aggregation and vascular s
  5. Block JB, Serpick AA, Miller W, Wiernik PH. Early clinical studies with lapachol (NSC-11905). Cancer Chemother Rep 2. 1974;4(4):27-8.
  6. Algranti E, Mendonça EM, Ali SA, Kokron CM, Raile V. Occupational asthma caused by Ipe (Tabebuia spp) dust. J Investig Allergol Clin Immunol 2005;15(1):81-3.

See these in context on the Pau D'arco 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

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