Catalpa bignonioides (Catalpa bignonioides): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Catalpa bignonioides work as a sedative?

Catalpa bignonioides exerts its sedative effects primarily through iridoid glycosides like catalposide and catalpol. These compounds act on the central nervous system to depress activity, leading to relaxation and drowsiness. While the exact molecular pathway requires further study, these constituents are known to possess neuroactive properties. Evidence supporting this mechanism is ranked at Level C, based on pharmacological profiling and traditional use rather than clinical trials.

Is Catalpa bignonioides safe to take during pregnancy?

No, Catalpa bignonioides is considered unsafe during pregnancy and breastfeeding. Traditional usage and safety classifications contraindicate its use for expecting mothers due to the risk of uterine stimulation or potential toxicity to the fetus. Additionally, the plant's sedative properties may pose risks during lactation. Women who are pregnant or nursing should avoid this herb entirely and consult a healthcare professional for safer alternatives.

What is the recommended dosage for Catalpa bark tea?

The traditional adult dosage for Catalpa bark tea involves steeping 1-2 teaspoons of dried bark in one cup of boiling water. This preparation is typically consumed twice daily. Because there is no standardized clinical evidence to establish a safe therapeutic window, users should strictly adhere to these conservative amounts. Exceeding this dosage may increase the risk of gastrointestinal upset or excessive sedation.

Does Catalpa bignonioides interact with other medications?

Yes, significant interactions exist with central nervous system (CNS) depressants. Because Catalpa possesses sedative properties, taking it alongside medications like benzodiazepines, barbiturates, or alcohol can lead to additive effects, causing excessive drowsiness or respiratory depression. It may also interact with other anthelmintic drugs. Individuals taking prescription medications should consult a physician before use to avoid adverse drug-herb interactions.

What are the traditional uses of Catalpa bignonioides?

Native Americans traditionally utilized Catalpa bignonioides as an effective anthelmintic to expel parasitic worms from the body. It was also employed as a mild sedative for nervous disorders and as a topical treatment for various skin conditions, utilizing the astringent properties of its tannins. Current evidence for these applications is rated Level C, relying heavily on historical ethnobotanical records rather than modern clinical trials.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 23 PubMed articles · model: gemma4:31b

Summary

Catalpa bignonioides, also known as southern catalpa or Indian bean tree, is a species containing pharmacologically active compounds such as iridoids [PMID:30708679, PMID:36616550].

Background

Catalpa bignonioides is native to the southeastern United States and is planted globally as an ornamental or shade tree [PMID:30708679, PMID:12860302].

Traditional uses

Catalpa pods have been used in traditional medicine in South America for the treatment of diabetes mellitus [PMID:33445612].

Active compounds

The plant is rich in iridoids, including catalpol and catalposide [PMID:33445612, PMID:21948221, PMID:41009020]. Other identified compounds include pinoresinol, vanillic acid [PMID:36080161], and heartwood components such as catalponol, epicatalponol, catalponone, and catalpalactone [PMID:24254942]. Fruits also contain flavonoids and phenolic compounds [PMID:41009020].

Mechanism of action

Pinoresinol and vanillic acid may stimulate myoblast proliferation by activating the Akt/mTOR signaling pathway and potentially binding to the insulin-like growth factor 1 receptor (IGF-1R) [PMID:36080161]. Certain iridoids from the plant have been shown to bind to heat shock protein 90 (Hsp90) alpha [PMID:23362862].

Clinical evidence

Evidence DInflammation and Pain

Crude extracts from pods, seeds, or leaves demonstrated prominent anti-inflammatory and antinociceptive actions in rodents [PMID:12860302]

Evidence DDiabetes (alpha-glucosidase inhibition)

Isolated compounds 2, 3, and 9 from the fruits exhibited significant inhibitory activity against the alpha-glucosidase enzyme [PMID:33445612]

Evidence DMuscle Loss

Pinoresinol and vanillic acid increased the proliferation of C2C12 mouse myoblast cells without cytotoxicity [PMID:36080161]

Evidence DColorectal Adenocarcinoma

Aqueous extracts and fractions of fruits were evaluated for anti-cancer activity in HT29 and HCT166 cell lines [PMID:41009020]

Evidence summary

The current evidence is limited to in vitro studies and rodent models (Level D), focusing on phytochemical characterization and preliminary biological activities such as anti-inflammatory, antioxidant, and enzyme-inhibitory effects.

PubMed sources

1.PMID: 36013410 (2022) — Effects of Different Growth Regulators on the Rooting of Catalpa bignonioides Softwood Cuttings. · Life (Basel, Switzerland)
2.PMID: 36616550 (2022) — Extraction and Characterization of New Cellulosic Fiber from Catalpa bignonioides Fruits for Potential Use in Sustainable Products. · Polymers
3.PMID: 17604916 (2007) — Antioxidant activity of Catalpa bignonioides. · Fitoterapia
4.PMID: 30708679 (2014) — First Report of Powdery Mildew Caused by Erysiphe elevata on Catalpa bignonioides in Korea. · Plant disease
5.PMID: 33445612 (2021) — The Chemical Constituents from Fruits of Catalpa bignonioides Walt. and Their α-Glucosidase Inhibitory Activity and Insulin Secretion Effect. · Molecules (Basel, Switzerland)

Catalpa bignonioides

Sources & Citations

Calculate a safe dose of Catalpa bignonioides