Pau D’arco
tabebuia spp.
Medicinal Actions
Analysis pending research update.
Primary Conditions Treated
General Dosage
15–20 g bark/pint water/day; 1.5–3.5 g dry bark/day; 15–20 g inner bark/pint/day; 0.25–0.5 cup fresh inner bark; 6–12 g dry inner bark; 9 g dry inner bark:45 ml alcohol/45 ml water; 300 mg bark capsules 3 ×/day; 3 capsules 3 ×/day; 3–7 ml extract in 45% ethanol/day.
Safety & Contraindications
Contraindications, Interactions, and Side Effects — Class 1. Side effects may include GI distress and nausea. “Whole bark has no known serious side effects”. Pregnant and lactating women should avoid. Guiraud et al. note that lapachol and beta-lapachone, though active against Candida, could be harmful. Multiple doses of oral lapachol at 500 mg/kg caused death with severe histopathological changes. In clinical trials, oral lapachol induced anticoagulant effects, nausea, and vomiting. After 6 doses at 9 mg/kg, beta-lapachone caused death, following anorexia, diarrhea, and weight loss. Napthaquinones have antifungal properties comparable to ketoconazole. Beta-lapachone is a better antifungal than ketoconazole. Since anticancer levels of naphthoquinones are toxic, pau d’arco cannot currently be recommended as a treatment for cancer. In large doses, lapachol and other