Pau d’Arco

Traditionally, pau d’arco has been used primarily as an immune-supportive and antifungal remedy, especially when fungal infections, minor infections, or general inflammation are the concern. It is commonly prepared as a decoction, tincture, or capsules.

Common Name: Pau d’Arco Latin Name: Tabebuia impetiginosa (also referred to as Handroanthus impetiginosus) Alternate Names: Lapacho, taheebo

• Parts used: inner bark
• Primary properties: antifungal, antimicrobial, anti-inflammatory
• Common preparations: decoction, tincture, capsules
• Best known for: supporting the body’s response to fungal and minor infections

Health Conditions Pau d’Arco Helps With

• Fungal infections — Pau d’arco’s naphthoquinone content gives it one of the strongest traditional and laboratory-supported reputations of any bark remedy for fungal concerns.
• Minor infections — Long traditional use across South American herbal medicine includes support for the body’s response to a range of minor bacterial infections.
• General inflammation — Traditionally taken as a broad anti-inflammatory tonic, particularly for conditions like arthritis and rheumatism.
• Immune resilience — Traditionally regarded as a “blood purifying” and immune-supportive herb, often taken during periods of illness or run-down health.
• Digestive discomfort — Traditional use includes support for digestive complaints, sometimes as part of broader cleansing formulas.
• Minor skin conditions — Applied topically in some traditional preparations to support skin affected by minor fungal or inflammatory concerns.

Compounds

• Lapachol — The most studied naphthoquinone in pau d’arco bark, associated with its traditional antifungal, antimicrobial, and anti-inflammatory reputation, and also the compound behind its bleeding-related caution.
• Beta-lapachone — A related naphthoquinone contributing to pau d’arco’s traditional antifungal and antimicrobial activity.
• Flavonoids — Contribute antioxidant support to pau d’arco’s overall traditional profile.
• Quinoids — A broader class of compounds, including lapachol, associated with the bark’s characteristic biological activity.
• Benzenoids — Present alongside pau d’arco’s other active compounds, contributing to its traditional profile.

Properties

• Antifungal — Pau d’arco’s defining traditional property, with naphthoquinone compounds showing notable activity against fungal organisms in laboratory research.
• Antimicrobial — Long traditional use includes broad support for the body’s response to infection.
• Anti-inflammatory — Traditionally taken to ease general inflammation, particularly in joints and connective tissue.
• Alterative — Traditionally regarded in South American herbalism as a “blood purifying” or cleansing tonic.

Recipes Using Pau d’Arco

• Traditional bark decoction — Pau d’arco inner bark simmered in water for an extended period, the most classic and widely used traditional preparation.
• Immune-support tea blends — Combined with other traditionally immune-supportive herbs into a tea taken during periods of illness.
• Tincture — The bark extracted into a concentrated liquid form for more flexible, convenient dosing.

Products Featuring Pau d’Arco

• Dried inner bark for decoction — The most traditional form, requiring a longer simmer than typical leaf or flower teas to properly extract its compounds.
• Tincture or liquid extract — Offers a more concentrated, shelf-stable option with flexible dosing.
• Capsules — A convenient, standardized option for those who prefer not to prepare a decoction.

Synergies

• Echinacea — Frequently combined with pau d’arco in immune-support formulas for complementary traditional antimicrobial benefits.
• Astragalus — Paired in tonic immune formulas, combining two traditionally immune-supportive herbs.
• Oregon grape — Combined in traditional antifungal and “blood purifying” blends, sharing similar traditional reputations.
• Ginger — Blended for digestive support and to balance pau d’arco’s intensity in tea preparations.

Safety & Precautions

Pau d’arco requires real, specific care, particularly around its effect on bleeding, and is best used for shorter, targeted periods rather than as an ongoing daily supplement.

Its key compound, lapachol, has documented blood-thinning activity, so pau d’arco should be avoided by anyone on anticoagulant or antiplatelet medications such as warfarin, given a real risk of increased bleeding when combined. It should be discontinued at least two weeks before any scheduled surgery, since it may increase bleeding risk during and after a procedure. At high doses, particularly with concentrated or isolated lapachol rather than the whole bark, pau d’arco has been associated with uncontrolled bleeding, nausea, and vomiting, so it’s important to use the whole bark form and stay within commonly recommended amounts rather than experimenting with higher doses. Pau d’arco should be avoided during pregnancy, since lapachol has been associated with a risk of pregnancy loss, and should also be avoided while breastfeeding due to insufficient safety data. It’s generally best used for short-term courses of a few weeks rather than long-term daily use, and it’s not recommended as a treatment for serious conditions like cancer, despite some early laboratory interest in its compounds, since human safety and effectiveness data for that use remain unclear. There is no well-established safety data on pau d’arco use in pets, so it’s best kept for human use only.

Q&A

Does pau d’arco taste bitter?

Yes, pau d’arco bark has a notably bitter, earthy, somewhat woody flavor, which is typical of many bark-based traditional preparations.

Because of this bitterness, pau d’arco tea is sometimes combined with other more palatable herbs, or taken in capsule or tincture form to bypass the taste altogether.

Can pau d’arco be used daily?

Pau d’arco is traditionally used for short, targeted courses, generally a few weeks at a time, rather than as an ongoing daily supplement, particularly given its effect on bleeding and blood clotting.

If considering longer-term use, it’s worth taking breaks between courses and checking in with a healthcare provider, especially if you’re also taking any medications that affect blood clotting.

How is pau d’arco decoction different from a regular tea?

A decoction involves simmering the bark in water for an extended period, often 15 to 20 minutes or longer, rather than simply steeping it briefly, since bark is dense and needs sustained heat to release its compounds.

This longer preparation method is specific to bark and root material, unlike leaf or flower teas, which typically only need a quick steep to be ready.

Is whole bark pau d’arco safer than concentrated extracts?

Generally, yes — traditional use of the whole bark tends to be better tolerated than concentrated or isolated lapachol, which has been associated with more significant side effects like uncontrolled bleeding at high doses.

Choosing a product made from the whole inner bark, rather than an isolated compound, and following commonly recommended amounts is a reasonable way to reduce risk while still following traditional use patterns.

Should pau d’arco be stopped before surgery?

Yes, pau d’arco should be discontinued at least two weeks before any scheduled surgery, since its effect on blood clotting may increase bleeding risk during and after the procedure.

If you use pau d’arco regularly, it’s worth letting your surgical team know ahead of time so they can plan accordingly.

References

• Plants of the World Online: Tabebuia impetiginosa
• PubMed: Scientific Literature on Tabebuia impetiginosa
• National Library of Medicine: Chemical Constituents from Tabebuia impetiginosa
• Wikipedia: Tabebuia impetiginosa
• ScienceDirect Topics: Tabebuia impetiginosa Research
• Memorial Sloan Kettering Cancer Center: About Herbs — Pau d’Arco
• PubMed: Lapachol Antifungal Research
• National Center for Complementary and Integrative Health: Pau d’Arco