holarrhena antidysenterica

Holarrhena antidysenterica: A Comprehensive Reference

1. Identity, Taxonomy, and Nomenclature

Holarrhena antidysenterica (syn. H. pubescens) Wall., belonging to the family Apocynaceae, is commended for the medicinal applications of its stem bark, leaves, and seeds in Ayurveda. Its full accepted name is Holarrhena antidysenterica (Roxb. ex Fleming) Wall. (Syn. Holarrhena pubescens (Buch.Ham.) Walrch ex. Don), commonly known as Tellicherry Bark in English and Kurchi in Hindi, belonging to the family Apocynaceae.

Holarrhena antidysenterica is a small deciduous tree that is distributed throughout the world; in India it is found in dry forests. The plant is found in tropical and subtropical regions of Asia and Africa. In India, it can be found throughout the country, especially in deciduous forests of tropical Himalayas, at altitudes ranging from 900 to 1,250 m.

Common Names and Synonyms

• English: Easter tree, Ivory tree, Tellicherry Bark
• Hindi: Kurchi
• Ayurvedic: Kutaja, Girimallikaa, Kaalinga, Kalingaka, Indravriksha, Shakra, Vatsaka, Shakraahvya; Indrayava, Indrabija, Vatsabija (seed); Kurchi (bark)
• Unani: Inderjo tallth, Teewaaj-e-Khataai
• Regional Indian names: Kadvo-indarjou in Gujarati, Keor in Kashmir, Tita-indarjou in Bengali, Amkudu in Telugu, Erukkalaipalai in Tamil; also referred to in English as Conesse Bark or Tellicherry Bark

Plant Parts Used

Most of the known chemical constituents in H. antidysenterica have been found in the stem, bark, leaves, and a few in the seeds as well. The root and bark are used in amoebic dysentery; the bark is astringent, anthelmintic, amoebicidal, and diuretic, and is used in colic, dyspepsia, piles, diseases of the skin and spleen. The seed is antibilious.

2. Traditional and Historical Use

Ayurvedic Tradition

Since ancient times, Holarrhena antidysenterica, often referred to as kurci, kurchi, or kutaj, has been used; the stem bark, leaves, and seeds, as a member of the Apocynaceae family, are used medicinally in Ayurveda. The plant has been documented in classical Ayurvedic texts like the Charaka Samhita and Sushruta Samhita. H. antidysenterica is used in the Indian Ayurvedic medicine system to treat atisaara (diarrhoea and dysentery). According to Charaka, the pods have stanyasodhana (a lactodepurant), the indrayava (seeds) have ama and asthapanopaga (adjuncts to enema) and the plant contains vamaka and arsoghna, which have emetic and anti-haemorrhoidal properties respectively.

It is traditionally used to balance Pitta and Kapha doshas and is especially effective in conditions involving inflammation, heat, and excess fluid in the digestive tract. Externally, a decoction can be used for cleansing non-healing wounds. With regard to the nervous system, it is indicated in conditions like tremor and intoxication. In the digestive system it is used to induce vomiting, as a carminative, and as an absorbent, and is indicated in hemorrhoids, helminthiasis, diarrhea, loss of digestive fire, abdominal cramp, and amoebic dysentery.

Unani Tradition

Known for its potent therapeutic properties, this plant has been a cornerstone of traditional medicine systems like Ayurveda and Unani for centuries. In the Unani system, the plant is known by the name Teewaaj-e-Khataai, and conessine is the principal alkaloid of Teewaaj (H. antidysenterica), used as a therapeutic drug for the treatment of dysentery and helminthic disorders.

Fermented Preparations

Kutajarishta finds its earliest mentions in classical Ayurvedic compendiums such as the Ashtanga Hridaya and Bhavaprakasha. Around the 8th–9th century CE, herbalists in Kerala and Gujarat began fermenting Kutaja bark decoctions with jaggery, honey, and herbal adjuncts to produce a palatable medicine for Pitta disorders. Kutajarishta is a traditional Ayurvedic fermented tonic crafted primarily from the bark of Holarrhena antidysenterica (known as Kutaja), blended with herbs like Haritaki, Vibhitaki, and Musta; this preparation aims to calm acute and chronic diarrhea, ease abdominal cramping, and restore digestive balance.

African Traditional Use

H. pubescens is a medicinally important plant of Africa as well as tropical and subtropical regions of Asia. It is widely used in Indian medicine for treating diseases including diarrhea, amoebic dysentery, liver disorders, irritable bowel syndrome, and bleeding piles. The plant is extensively reported in traditional uses among the natives of Asia and Africa.

Scope of Traditional Applications

In Indian traditional medicine, H. antidysenterica is popularly used as a medication for dysentery, diarrhoea, and intestinal worms. Plant parts such as the bark are used to treat antimicrobial and anti-inflammatory conditions, analgesics, amoebiasis, and chronic bronchitis, and locally for boils and ulcers; a decoction of the bark is used in bleeding and piles.

3. Key Constituents and Active Compounds

Overall Phytochemical Profile

The major constituents are steroidal alkaloids, flavonoids, triterpenoids, phenolic acids, tannin, resin, coumarins, saponins, and ergostenol; 68 alkaloids have been discovered from various parts of H. antidysenterica to date. The seeds also contain gallic acid, rutin, and quercetin.

Principal Steroidal Alkaloids

The bark of H. antidysenterica contains alkaloids, the most important of which is the steroidal alkaloid conessine, which is the major therapeutic constituent. Chemical analysis of H. pubescens extracts revealed the presence of several bioactive compounds, such as conessine, isoconnessine, conessimine, conimine, conessidine, conkurchicine, holarrhimine, conarrhimine, mokluangin A–D, and antidysentericine.

The stem bark of Holarrhena antidysenterica contains conessine (C₂₄H₄₀N₂), isoconessine (C₂₄H₄₀N₂), conessimine/isoconessimine (C₂₃H₃₈N₂), and conarrhimine (C₂₁H₃₄N₂).

Conessine (C₂₄H₄₀N₂) is the main medicinal compound in Holarrhena antidysenterica against dysentery and helminthic infections; it is a white-to-tan powder that exhibits a yield of up to 0.4% of the dry weight of the bark, and is a sterol with a structure analogous to 7-ergosten-3-ol and γ-stigmasterol.

Additional alkaloids identified include concessidine, connessimine, conkurchine, holadiene, holarrhenine, holarrhimine, kurchine, holarrhine, kurchicine, holadysine, holadysaine, holantosines A and B, kurchaline, kurchiphyllamine, and holacetine.

4. Mechanisms of Action

Gastrointestinal Motility

H. antidysenterica produces gastrointestinal tract stimulation by activation of histamine receptors and relaxes the gastrointestinal tract by Ca⁺⁺ channel blockade, which provides the basic ground for its usefulness in gut motility problems such as constipation, colic, and diarrhea.

Anti-Inflammatory Mechanism

Methanolic bark extract of H. antidysenterica exhibited decreased levels of nitric oxide and malondialdehyde and showed increased levels of superoxide dismutase and glutathione in 2,4-Dinitrobenzene sulfonic acid-induced colitis in male albino Wistar rats. The decreased level of nitric oxide suggests that reduction in iNOS generation may be responsible for the anti-inflammatory effect. H. antidysenterica treatment also prevented rupture of goblet cells, inflammatory cellular infiltration, and inflammation in the mucosal layer.

Efflux Pump Inhibition (Antimicrobial Resistance Modulation)

Conessine is the main steroidal alkaloid of Holarrhena antidysenterica, which is commonly associated with its reported biological activities. Current research demonstrates that conessine exhibits antimicrobial activity and inhibits some multidrug efflux pumps responsible for conventional antibiotic resistance. Experimental and computational studies have also reported antiviral, antiplasmodial, anti-inflammatory, and neuroprotective activities of conessine.

Extract from Holarrhena antidysenterica displayed resistance-modifying ability to enhance novobiocin and rifampicin activity against Acinetobacter baumannii; it has been demonstrated that the extract potentiated the effect of antibiotics by acting as a permeabilizer.

Acetylcholinesterase Inhibition

Since alkaloids from some plants have already been known to inhibit acetylcholinesterase (AChE), a study tested some alkaloids of H. antidysenterica for similar action. Out of five isolated alkaloids (conessine, isoconessimine, conessimine, conarrhimine, and conimine), conessimine exhibited the most profound effects, with an IC₅₀ value of 4 μM. The study concluded that these alkaloids can potentially be used in drugs for treating neurological disorders.

Anti-Amnesic / Neuroprotective Mechanism

Administration of ethanolic extract of H. antidysenterica seeds for 28 days to groups of streptozotocin-treated animals significantly decreased the level of AChE as compared to the diseased group, prevented the rise in malondialdehyde (MDA) levels, and attenuated glutathione (GSH) depletion in a dose-dependent manner. Cholinergic dysfunction was assessed by acetylcholinesterase activity, and decreased levels of AChE along with preserved MDA and glutathione levels demonstrated anti-amnesic properties.

5. Scientific Evidence by Area of Use

5.1 Gastrointestinal Disorders (Diarrhea and Dysentery)

Overview and evidence strength: Moderate (animal, in vitro, and limited clinical evidence)

H. pubescens has been demonstrated by different in vitro studies to have a wide range of medicinal properties, particularly anti-diarrheal, anti-amoebiasis, and gut-relaxant properties.

Animal studies: The severity of castor oil–induced diarrhea was reduced significantly (p<0.05) with H. antidysenterica seed extract at 200 and 400 mg/kg body weight, showing equivalent effectiveness to that of loperamide-treated groups. Similarly in an E. coli–induced diarrhea protocol, no significant variation in body weight was observed in the negative control, gentamicin-treated, and H. antidysenterica–treated groups at 200 mg/kg and 400 mg/kg body weight, respectively; the study concluded that the ethanolic extract effectively controlled diarrhea and decreased the severity of clinical signs of castor oil– and E. coli–induced diarrhea in Wistar rats.

Clinical evidence: A daily intake of bark powder for 15 days was reported to have completely cured patients suffering from amoebiasis. Another clinical trial investigated the therapeutic efficacy of "Amoebin cap", a medicine for amoebiasis containing H. antidysenterica as one of its constituents.

A search of PubMed using the term "Holarrhena" specifying article type "Clinical Trials" retrieved no published papers; however, a search of Google Scholar retrieved more than a dozen publications, most from India. The first clinical trial with alkaloids of H. pubescens for the treatment of amoebic hepatitis was carried out by Chopra and De. A later study with 40 patients suffering from intestinal amoebiasis and/or giardiasis using H. pubescens found that in 70% of patients outcomes were favorable.

However, clinical trials on the therapeutic potential of this plant are limited and largely preliminary.

5.2 Inflammatory Bowel Disease and Colitis

Evidence strength: Preliminary (animal and cell-based studies)

H. antidysenterica is commonly used in Indian traditional medicine to treat inflammatory bowel disease, dysentery, diarrhoea, and worms in the intestines. Scientific validation is largely preclinical: animal studies using 2,4-dinitrobenzene sulfonic acid–induced colitis models have demonstrated reductions in oxidative and inflammatory markers as described in the mechanisms section above. No rigorous human clinical trials specific to IBD have been identified in the published literature.

5.3 Amoebiasis

Evidence strength: Historical and early clinical, with mechanistic support

Holarrhena antidysenterica is primarily used in modern herbal medicine and pharmacognosy to combat amoebic and bacterial dysentery, making it particularly effective against Entamoeba histolytica, the protozoan responsible for amoebiasis. Conessine also has significant anti-amoebic activity, but it needs to be used with caution because it can produce neurological problems such as vertigo, tremors, insomnia, agitation, or anxiety.

5.4 Anti-Infective / Antimicrobial Activity

Evidence strength: Moderate in vitro and animal; no confirmed human clinical trials

The efficacy of Holarrhena antidysenterica extract and its major steroidal alkaloid conessine as resistance-modifying agents (RMAs) on the susceptibility of A. baumannii to novobiocin and rifampicin was investigated; a significant synergistic activity of both the extract and conessine in combination with either novobiocin or rifampicin with a fractional inhibitory concentration index ≤0.5 was demonstrated.

Combination therapies of conessine or steroidal alkaloids with levofloxacin enhanced bacterial inhibition in vitro and restored antibiotic efficacy in vivo compared to the constituent monotherapies; neither conessine nor the steroidal alkaloids induced any detectable toxicity in Galleria mellonella larvae. The enhanced efficacy of the combination treatments was most pronounced with conessine and correlated with reduced larval burden of infecting P. aeruginosa. Notably, the enhanced efficacy of conessine/levofloxacin combinations was only detected in the parent strain and strains that overexpressed the MexAB-OprM or MexEF-OprN efflux systems. Steroidal alkaloids from Holarrhena antidysenterica, and particularly conessine, restored levofloxacin efficacy against resistant P. aeruginosa strains possessing efflux-mediated MDR phenotypes.

5.5 Anti-Malarial Activity

Evidence strength: Preliminary (in vitro and animal studies)

The anti-malarial effects of conessine isolated from Holarrhena antidysenterica, which is frequently used against malaria in the Garhwal region of north-west Himalaya, have been evaluated. In vitro anti-plasmodial activity was assessed using schizont maturation and parasite lactate dehydrogenase (pLDH) assay. Cytotoxic activities were determined on L-6 cells of rat skeletal muscle myoblast. The four-day test for anti-malarial activity against a chloroquine-sensitive Plasmodium berghei NK65 strain in BALB/c mice was used for monitoring in vivo activity.

5.6 Anti-Diabetic Activity

Evidence strength: Preliminary (animal studies only)

Oral administration of methanolic extract (250 mg/kg) for 18 days resulted in a decrease in blood glucose level compared to the diabetic control. In addition, oral administration of the extract significantly decreased serum total cholesterol.

Treatment with methanolic extract of H. antidysenterica (MEHA) significantly prevented a fall in body weight as compared to the diabetic control group; the elevated levels of blood glucose and plasma cholesterol levels were significantly depleted, and HbA1c level was reduced. All antidiabetic evidence to date comes from animal models; no human clinical trials have been published establishing efficacy in diabetes.

5.7 Acetylcholinesterase Inhibition and Neuroprotection

Evidence strength: Preliminary (in vitro and animal)

Recent studies have unveiled novel activities such as angiotensin-converting enzyme inhibition, acetylcholinesterase inhibition, anti-amnesic effects, and neuroprotective properties. The in vitro AChE inhibition data and animal amnesia model results (detailed in the mechanisms section above) provide a basis for further exploration; no human clinical trials in neurological conditions have been documented.

A separate study investigated the CNS-stimulating activity of methanolic bark extract on Swiss albino mice. The results showed that regardless of the dosage, the extract significantly decreased and relaxed the gripping capabilities of the muscles and also the spontaneous locomotive activity, thus indicating a depressing effect on the CNS. This finding highlights a complex and potentially dual CNS profile that requires further investigation.

5.8 Hemorrhoids (Bleeding Piles)

Evidence strength: Limited clinical evidence in multi-herb formulations

Total 144 patients with 1st, 2nd, and 3rd degree hemorrhoids were treated with two tablets of Amroid orally thrice a day and Amroid ointment applied locally per rectum before and after defecation for 4 weeks, and patients were followed for 8 weeks. Highly significant (p<0.0001) results were found in ano-rectal pain, inflammation, bleeding per ano, itching per ano, constipation, and prolapsed piles even after treatment of 1 week, sustained throughout the 8-week follow-up. This clinical trial concluded that Amroid tablet and Amroid ointment have potential to cure hemorrhoid up to third degree. It should be noted that Amroid is a multi-herb formulation, so the contribution of H. antidysenterica alone cannot be isolated from these results.

5.9 Antioxidant Activity

Evidence strength: Preliminary (in vitro)

Studies have evaluated the antioxidant and antidiabetic potential of the stem bark of Holarrhena pubescens. The antioxidant activity was determined by the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, where ascorbic acid was taken as a positive control. The antioxidant property was later exploited and the methanolic extract of the plant was tested for antihyperglycemic activity in glucose-overloaded hyperglycemic mice.

5.10 Diuretic and Anti-Urolithic Activity

Evidence strength: Preliminary (animal)

Aqueous seed extract of H. antidysenterica showed a significant increase in urine output of Wistar rats at a dosage range of 30–100 mg/kg. A substantial increase was also observed in the amount of Na⁺ and K⁺ ions excreted through urine of treated rats.

6. Body Systems and Health Areas of Association

Pharmacological studies document anti-amnesic, neuroprotective, acetylcholinesterase inhibitory, anti-diabetic, anti-urolithic, antibacterial, anti-haemorrhoidal, analgesic, anti-inflammatory, anti-malarial, anti-diarrhoeal, anti-mutagenic, antihypertensive, antioxidant/free radical scavenging, and diuretic activity. Moreover, some additional properties discovered include anti-malarial, anti-diabetic, anti-oxidant, anti-urolithic, anti-mutagenic, CNS-stimulating, angiotensin-converting-enzyme inhibitory, and acetylcholinesterase inhibitory activity.

• Gastrointestinal System: Diarrhea, dysentery, amoebiasis, IBS, IBD, colitis, hemorrhoids, colic, intestinal worms
• Infectious Disease: Bacterial infections (including drug-resistant organisms), parasitic (amoebic) infections, malaria
• Neurological System: Acetylcholinesterase inhibition (Alzheimer's model), anti-amnesic effects, CNS activity
• Metabolic / Endocrine System: Antidiabetic (glycemic control, lipid-lowering in animal models)
• Renal System: Diuretic, anti-urolithic
• Dermatological: Topical use for boils, ulcers, skin diseases, wound healing
• Respiratory System: Traditional use in chronic bronchitis
• Cardiovascular: Antihypertensive (angiotensin-converting-enzyme inhibition reported in vitro)

7. Dosage Forms and Reported Dosages

Multiple dosage forms are employed across traditional and research contexts. The following dosages are as cited in sources and reflect traditional or experimental use; they do not represent clinically validated therapeutic recommendations.

Traditional/Ayurvedic Preparations

• Bark powder (oral): About 3 to 6 grams of Holarrhena antidysenterica powder is taken twice a day with water, honey, or buttermilk.
• Decoction (bark): Stem bark — 20–30 g for decoction. 50 to 100 ml of decoction is consumed twice daily, generally before meals.
• Decoction (clinical traditional reference): A decoction prepared by simmering dried bark in water until the volume reduces by half; dose of 20–30 ml three to four times a day has been described.
• Capsule/tablet: 250 to 500 mg per capsule or tablet can also be taken twice a day with water.
• External paste: A paste made from the leaves or other parts can be applied externally to boils, ulcers, and other skin ailments.
• Fermented liquid (Kutajarishta): Kutajarishta is a traditional Ayurvedic fermented tonic crafted primarily from the bark of Holarrhena antidysenterica (known as Kutaja), blended with herbs like Haritaki, Vibhitaki, and Musta.

Experimental Dosages Reported in Animal Studies

• Seed extract at 200 and 400 mg/kg body weight (oral) significantly reduced castor oil–induced diarrhea in Wistar rats (p<0.05).
• Oral administration of methanolic extract at 250 mg/kg for 18 days resulted in decreased blood glucose levels compared to a diabetic control.
• The methanolic bark extract was tested for hypoglycemic activity at two dose levels, 250 and 500 mg/kg, where glipizide 5 mg/kg was taken as the standard reference drug.
• Aqueous seed extract showed significant increase in urine output in Wistar rats at a dosage range of 30–100 mg/kg.

8. Safety Considerations

General Safety Profile

The plant is extensively used in Ayurveda and other traditional medicinal systems without obvious adverse effects. However, this characterization is based predominantly on traditional use reports rather than formal systematic safety studies.

Conessine-Specific Neurological Concerns

Conessine has sedative, central nervous system depressant, cardiac depressant, antipyretic, and analgesic activities. It also has significant anti-amoebic activity, but it needs to be used with caution because it can produce neurological problems such as vertigo, tremors, insomnia, agitation, or anxiety.

Potential Hepatotoxicity at High Doses

In a subchronic toxicity study, an ethanol extract of H. pubescens along with polyvinyl pyrrolidone, administered at dosages of 270 and 530 mg/kg BW/day (which is 10 and 20 times more than the dosage used for humans), caused hepatotoxicity in rats when given for 3 consecutive months. This finding pertains to supratherapeutic doses in a rodent model and should be interpreted in that context.

Toxicity Limitations of Principal Compound

Conessine, the key alkaloid of Holarrhena, has broad pharmacology yet is limited by toxicity issues; advanced delivery systems may improve conessine's efficacy, but robust clinical validation is required.

CNS Dual Activity

A study investigating the CNS-stimulating activity of methanolic bark extract on Swiss albino mice showed that regardless of the dosage, the extract significantly decreased and relaxed the gripping capabilities of the muscles and also the spontaneous locomotive activity, indicating a depressing effect on the CNS. This apparent CNS-depressant finding in animal models raises questions about potential interactions with other CNS-active agents, though human data are absent.

Limitations of Clinical Evidence Base

Holarrhena antidysenterica has established relevance in ethnomedicine but limited clinical evidence. Clinical trials on the therapeutic potential of this plant are limited and largely preliminary. The majority of published pharmacological data derives from in vitro assays and animal models, predominantly from Indian institutions. Rigorous randomized controlled trials with standardized preparations, defined dosing, and pre-specified outcomes are largely absent from the current literature.

References

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