Question 1

How does Quassia amara work as a digestive bitter?

Accepted Answer

Quassia wood contains intensely bitter quassinoids, particularly quassin and neoquassin, which stimulate bitter taste receptors on the tongue. This triggers the vagus nerve to increase gastric acid secretion, bile flow, and digestive enzyme production. The enhanced digestive cascade improves appetite and nutrient absorption. Additionally, simalikalactone D contributes antimalarial properties through cytotoxic effects on parasites. Evidence level: B for digestive mechanisms.

Question 2

Does Quassia amara interact with any medications?

Accepted Answer

Quassia may interact with medications metabolized by the liver due to its potential hepatotoxic effects at high doses. Theoretically, it could alter metabolism of drugs processed through cytochrome P450 enzymes. Patients taking antidiabetic medications should use caution, as Quassia may affect blood glucose levels. Limited clinical interaction data exists, so patients on prescription medications should consult a healthcare provider before use. Evidence level: C for interactions.

Question 3

What is the recommended dosage for Quassia wood tea?

Accepted Answer

The traditional adult dosage for Quassia wood is 0.5-1 grams of dried wood prepared as a tea, taken three times daily before meals to stimulate digestion. For head lice treatment, a stronger infusion is prepared and applied topically to the scalp, left on for several minutes, then rinsed. Due to the herb's intense bitterness and potential cytotoxicity at high doses, exceeding recommended amounts is not advised. Evidence level: B for dosage recommendations.

Question 4

Is Quassia amara safe during pregnancy and breastfeeding?

Accepted Answer

Quassia wood is contraindicated during pregnancy and breastfeeding. The quassinoids present in the herb, particularly simalikalactone D, demonstrate cytotoxic properties that may pose risks to fetal development and infant health. Traditional use has established its potential as an abortifacient. Nursing mothers should also avoid Quassia, as active compounds may pass into breast milk. Women who are pregnant, planning pregnancy, or breastfeeding should not use this herb internally or topically. Evidence level: B for pregnancy safety.

Question 5

Does Quassia wood work for head lice treatment?

Accepted Answer

Quassia wood has been used traditionally as a topical treatment for head lice, with some evidence supporting its efficacy. The quassinoids exhibit insecticidal properties that may kill lice upon contact. A typical preparation involves steeping the wood in water to create an infusion, which is applied to the scalp and hair, left for 10-20 minutes, then rinsed thoroughly. While promising, it should not replace proven medical treatments for confirmed infestations without consulting a healthcare provider. Evidence level: B for topical lice treatment.

Question 6

What are the side effects of taking Quassia amara?

Accepted Answer

Common side effects of Quassia wood include nausea and vomiting, particularly when taken at high doses due to its intense bitterness. Excessive or prolonged internal use may cause cytotoxicity, potentially affecting liver and kidney function. Some users report headache or dizziness. The herb's bitter compounds can irritate the gastrointestinal tract in sensitive individuals. To minimize adverse effects, stick to recommended dosages and avoid long-term continuous use without medical supervision. Evidence level: B for safety profile.

Quassia Wood

Sources & Citations

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Pregnancy & lactation

Drug interactions

Evidence summary

PubMed sources

Government sources