How does Abrus precatorius work medicinally?

The root contains flavonoids, alkaloids, and abruslactone that may provide anti-inflammatory and antipyretic effects, traditionally used for cough and fever relief. The seeds contain abrin, an extremely toxic protein that inhibits protein synthesis by inactivating ribosomes at the cellular level. This mechanism causes severe cellular damage and is responsible for the lethal toxicity of seeds. Evidence level: C for root benefits; well-established for seed toxicity.

Does Abrus precatorius interact with any medications?

No specific clinical drug interaction studies exist for Abrus precatorius root preparations (Evidence level: C). Due to limited safety data, caution is advised when combining with immunosuppressants, anticoagulants, or hepatically-metabolized medications. The toxic seeds should never be used internally under any circumstances. Always consult a qualified healthcare provider before combining any Abrus preparations with prescription medications.

What is the correct dosage for Abrus precatorius root?

Traditional use involves only the root, prepared as a decoction at 3-5 grams daily for cough and fever (Evidence level: C/Traditional). Seeds must never be consumed internally due to potentially lethal abrin content. External application of root preparations for skin conditions follows traditional protocols. Professional guidance is essential given the plant's toxic components and narrow safety margin.

Is Abrus precatorius safe during pregnancy and breastfeeding?

Abrus precatorius is contraindicated during pregnancy and breastfeeding (Evidence level: C). The plant contains abrin and other compounds that may cause uterine contractions or fetal harm. Seeds are extremely toxic and potentially lethal to both mother and fetus. Root preparations also carry risks due to insufficient safety data. Pregnant and nursing individuals should avoid all parts of this plant entirely.

Are Abrus precatorius seeds poisonous to humans?

Yes, Abrus precatorius seeds are extremely poisonous and potentially lethal. They contain abrin, one of the most toxic plant proteins known, which inhibits protein synthesis and causes fatal organ damage even in tiny amounts. Ingesting one crushed seed can be deadly. Symptoms include severe gastrointestinal distress, organ failure, and death. Seeds must never be used internally under any circumstances (Evidence level: A for toxicity).

Abrus precatorius (Abrus precatorius)

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 30 PubMed articles · model: gemma4:31b

Summary

Abrus precatorius, also known as the jequirity bean or rosary pea, is a plant containing the highly toxic protein abrin [PMID:15181663, PMID:32349421]. While it has traditional medicinal uses, it is recognized as a significant biological threat agent due to its extreme lethality [PMID:32349421, PMID:37459705].

Background

Abrus precatorius is an herbaceous, flowering plant widely distributed in tropical and subtropical regions, particularly in India [PMID:25183095, PMID:38513827]. It is commonly referred to as Gunja, Jequirity, or the rosary pea [PMID:25183095, PMID:32349421].

Traditional uses

It is used in folk medicine for ailments including bronchitis, jaundice, hepatitis, contraception, tumors, abortion, and malaria [PMID:35714881]. In China, the leaves are served as tea, and in India, the roots are used as a substitute for Glycyrrhiza uralensis or for glycyrrhizin extraction [PMID:35714881].

Active compounds

The plant contains abrin (a toxalbumin/lectin), Abrus precatorius agglutinin, flavonoids, triterpene glycosides, alkaloids, phenols, and isoflavan quinones (such as abruquinones B, I, J, K, and L) [PMID:25183095, PMID:33919561, PMID:36959155, PMID:24382449]. Specific compounds include lupenone, 24-methylenecycloartenone, luteolin, abrusogenin, cirsimaritin, and hispidulin [PMID:25089582, PMID:39530083].

Mechanism of action

Abrin acts as a type 2 ribosome inactivating protein that irreversibly binds to the 60-s ribosomal subunit, thereby inhibiting protein synthesis and causing cell death [PMID:15181663, PMID:31456429, PMID:29438273]. This leads to endothelial cell damage, increased capillary permeability, and subsequent tissue oedema [PMID:15181663].

Clinical evidence

Evidence DDiabetes/Hyperglycaemia

Leaf extract significantly increased insulin-stimulated glucose uptake in C2C12 myotubes in vitro [PMID:38490239]

Evidence DArthritis

Macerated oil from aerial parts showed antioxidant and anti-arthritic potential in vitro [PMID:38817355]

Evidence DTrypanosomiasis

Abruquinones B and I demonstrated potent in vitro trypanocidal activity [PMID:24382449]

Evidence DBreast Cancer

In silico analysis suggests leaf phytochemicals may cause apoptosis in various cancer types [PMID:39323672]

Evidence DSchistosomiasis

In silico screening identified abrusogenin, cirsimaritin, and hispidulin as potential inhibitors of SmPNP [PMID:39530083]

Evidence DParkinson's Disease

In silico docking of seed terpenoids showed binding affinities against alpha-synuclein, COMT, and MAO-B [PMID:34707350]

Safety & adverse effects

Abrin is highly toxic with an estimated human fatal dose of 0.1-1 microgram/kg [PMID:15181663]. Ingestion of seeds causes severe gastrointestinal symptoms including vomiting, diarrhea, hematemesis, and hematochezia [PMID:31456429, PMID:37273369]. Severe poisoning can lead to pulmonary oedema, hypertension [PMID:11736775], multi-organ failure [PMID:32475191], and neurological complications such as acute demyelinating encephalitis or acute disseminated encephalomyelitis [PMID:17357388, PMID:31249468]. A retrospective study of 112 patients reported a mortality rate of 5.35% [PMID:28515607].

Evidence summary

The evidence is primarily composed of case reports of toxicity (B/D), in vitro studies (D), and in silico modeling (D). There are no RCTs or systematic reviews supporting therapeutic efficacy; most high-level data focuses on the toxin's lethality and forensic detection.

PubMed sources

1.PMID: 15181663 (2003) — Abrin poisoning. · Toxicological reviews
2.PMID: 33164294 (2021) — Is it safe to consume traditional medicinal plants during pregnancy? · Phytotherapy research : PTR
3.PMID: 32349421 (2020) — Mapping Immunodominant Antibody Epitopes of Abrin. · Antibodies (Basel, Switzerland)
4.PMID: 25183095 (2014) — Ethno botanical and Phytophrmacological potential of Abrus precatorius L.: A review. · Asian Pacific journal of tropical biomedicine
5.PMID: 31456429 (2020) — Massive fatal overdose of abrin with progressive encephalopathy. · Clinical toxicology (Philadelphia, Pa.)

Abrus precatorius

Sources & Citations