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DOI:

https://doi.org/10.5281/zenodo.19595679

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INTERNATIONAL JOURNAL OF DIAGNOSTICS AND RESEARCH

Hirudotherapy, Medicinal Leech Therapy, and Jalaukavacharana:

A Comprehensive Review of PubMed-Indexed Literature with Emphasis on

Biochemical Mechanisms, Clinical Applications, and Ayurvedic Perspectives

Dr. Nilesh Dalvi ¹

¹Dept. of Streeroga and Prasuti Tantra,Vaidya Yagyadatta Sharma, Ayurved Mahavidyalaya , Khurja – 203131

Corresponding Author: Dr.Nilesh Dalvi

E-Mail : Nilesh.dalvi1472@gmail.com

Article Info: Article Received on : 27/03/2026

Article Reviewed on: 04/04/2026

Article Published on : 15/04/2026

Cite this article as: - Dalvi, N. (2026). Hirudotherapy, Medicinal Leech Therapy, and Jalaukavacharana : A Comprehensive

Review of PubMed-Indexed Literature with Emphasis on Biochemical Mechanisms, Clinical Applications, and Ayurvedic

Perspectives.

In

International

Journal

of

Diagnostics

And

Research

(Vol.3,Number3,pp.11–25).Zenodo.

https://doi.org/10.5281/zenodo.19595679

Abstract

Background: Hirudotherapy — the therapeutic application of medicinal leeches (Hirudo medicinalis and related species) — is

one of the oldest biological treatments known to humanity, with documented use extending back to ancient Egypt, Greece, and

India.^[1,2]Within Ayurvedic medicine, the practice is systematically codified as Jalaukavacharana, a sub-procedure of

Raktamokshana (bloodletting), described extensively in the Sushruta Samhita and Charaka Samhita.^[33]Despite its ancient origins,

modern pharmacological and molecular research has revealed that leech saliva contains more than 100 bioactive compounds that

exert potent anticoagulant, anti-inflammatory, analgesic, and antimicrobial effects.^[3,5]Objective: This review critically synthesizes

PubMed-indexed literature on hirudotherapy, medicinal leech therapy (MLT), and Jalaukavacharana (JA) to provide a

comprehensive, evidence-graded summary of mechanisms of action, species classification, clinical applications, Ayurvedic

perspectives, safety profiles, complications, and future research directions.Methods: A comprehensive electronic search was

conducted across PubMed/MEDLINE, Cochrane Library, Scopus, and DHARA databases using the MeSH terms and keywords:

"hirudotherapy," "medicinal leech therapy," Hirudo medicinalis, "Jalaukavacharana," "Raktamokshana," and "leech saliva."

Publications from 1990 to March 2026 in English were screened. A total of 118 articles meeting inclusion criteria were analyzed,

including randomized controlled trials (RCTs), systematic reviews, observational studies, and case reports. Results: More than 20

pharmacologically identified bioactive compounds in leech saliva — including hirudin, calin, saratin, hyaluronidase, destabilase,

and eglins — account for the diverse therapeutic actions of MLT.^{[5,6,26,27,28]}Strong evidence supports hirudotherapy in venous

congestion and flap salvage in reconstructive surgery.^[12]Moderate-to-strong evidence exists for knee osteoarthritis and chronic

low back pain.^[9,10,11]Preliminary evidence supports use in varicose veins, thrombophlebitis, hemorrhoids, skin disorders, and

selected ophthalmic conditions.^[16,17,25]Ayurvedic applications described in Jalaukavacharana are largely consistent with modern

biochemical understanding.^[8,15,33]Key safety concerns include Aeromonas spp. infection, requiring antibiotic prophylaxis, and

excessive bleeding.^[13,24]Conclusion: Hirudotherapy occupies a unique and validated position at the intersection of traditional and

modern medicine. It is an FDA-cleared modality for surgical applications^[12]and merits continued rigorous investigation for a

broader range of chronic inflammatory and musculoskeletal conditions. The integration of Jalaukavacharana into evidence-based

Ayurvedic practice represents a promising domain for future clinical trials.^[8,15]

Keywords: Hirudotherapy; Medicinal leech therapy; Hirudo medicinalis; Jalaukavacharana; Raktamokshana; Leech saliva;

Hirudin; Ayurveda; Complementary medicine; Osteoarthritis; Flap salvage.

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1. Introduction :

removal alone. More than 100 proteins have been

identified in the saliva of Hirudo medicinalis, with

the most studied being hirudin, one of the most

Hirudotherapy, derived from the Latin word hirudo

(leech), refers to the therapeutic application of live

medicinal leeches for disease management. The

practice is one of the oldest biological therapies

potent

naturally

occurring

direct

thrombin

inhibitors known to science.^[26,6]

documented

across

multiple

civilizations.

In parallel, the World Health Organisation's

growing recognition of traditional medicine

Archaeological evidence from Egyptian tombs

dating to approximately 1500 BCE depicts leech

application,^[1,2]while ancient Sanskrit texts — most

notably the Sushruta Samhita (circa 600 BCE) —

provide the most systematic early classification,

identification, and clinical indication framework for

systems has spurred renewed academic interest in

Jalaukavacharana, the Ayurvedic formalisation of

leech therapy. Indexed studies in PubMed now

document its application across a range of

conditions,,

including

skin

joint

disorders,

what

is

known

in

Ayurveda

as

haemorrhoids,

diseases,

ophthalmic

Jalaukavacharana.^[33]The history of hirudotherapy

in the Western tradition traces through Hippocrates

(circa 400 BCE), the Roman physician Galen (130–

210 CE), the medieval Arab physician Avicenna

(Ibn Sina, 980–1037 CE), and reached the apex of

its popularity in 19th-century Europe, particularly

in France under François Broussais, when millions

of leeches were consumed annually for all manner

of ailments.^[1,34]The decline of hirudotherapy

followed the rise of germ theory and chemical

pharmacology. Its scientific renaissance began in

conditions, and wound healing, with a growing

overlap between the Ayurvedic indications and

those

investigated

in

modern

biomedicine.^{[8,15,16,17,25]}

Despite this body of literature, comprehensive

reviews that bridge the Ayurvedic and biomedical

evidence bases remain scarce, and the evidence

quality for many applications is heterogeneous. The

present review addresses this gap by critically

evaluating the totality of PubMed-indexed literature

on hirudotherapy, MLT, and Jalaukavacharana,

with a structured analysis of mechanisms, species,

the

mid-20th

century

when

vascular

and

reconstructive surgeons discovered the remarkable

utility of leeches for managing venous congestion

in replanted or free-flap tissue.^[12]

clinical

directions.^[4,7,8]

applications,

safety,

and

future

2. Materials And Methods :

2.1 Search Strategy

The modern validation of hirudotherapy rests on

the pharmacological characterisation of leech

saliva. Unlike historical bloodletting, which was

An electronic literature search was conducted in

PubMed/MEDLINE (National Library of

non-specific,

the

contemporary understanding

Medicine), Cochrane Library, Scopus, EMBASE,

and the DHARA (Digital Helpline for Ayurveda

Research Articles) database. The search covered

publications from January 1990 to March 2026.

recognises that the therapeutic benefit derives

primarily from the complex cocktail of bioactive

salivary compounds rather than blood volume

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Evidence-Based Medicine (OCEBM) 2011

The following Medical Subject Headings (MeSH)

terms and free-text keywords were employed

individually and in combination: "hirudotherapy,"

"medicinal leech therapy," "medicinal leech,"

hierarchy. Discrepancies between reviewers were

resolved by discussion and consensus.

3. Taxonomy And Species Classification :

3.1 Zoological Classification:

Hirudo

medicinalis,

Hirudo

verbana,

"Jalaukavacharana,"

"Jalaukavacharan,"

Medicinal leeches belong to the phylum Annelida,

"Raktamokshana,"

"leech

"Ayurveda

saliva,"

leech."

"hirudin,"

Boolean

class

Clitellata,

subclass

Hirudinea,

order

"Raktamoksha,"

Arhynchobdellida, and family Hirudinidae. More

than 600 species of leeches have been described

globally; however, only approximately 15 species

are classified as medically significant.^[4,5]Hirudo

medicinalis (European medicinal leech) possesses

the widest therapeutic characterization and is the

species most commonly referenced in PubMed

literature. Other clinically studied species include

operators (AND, OR) and truncation were applied

to maximise search yield.^[7]

2.2 Inclusion and Exclusion Criteria :

Studies were included if they (i) reported original

clinical data, experimental findings, systematic

reviews, or meta-analyses related to MLT,

hirudotherapy, or Jalaukavacharana; (ii) were

published in peer-reviewed journals; (iii) were

available in the English language; and (iv) reported

outcomes relevant to clinical efficacy, safety,

pharmacology, or traditional medical practice.

Hirudo verbana (formerly identified as

H.

medicinalis in the Balkan and Mediterranean

regions), Hirudo orientalis (Central Asia), Hirudo

nipponia (East Asia), Poecilobdella granulosa,

Hirudinaria javanica, and Hirudinaria manillensis

(South and Southeast Asia).^[32,20]

Animal

studies

that

provided

foundational

mechanistic data were included for biochemical

sections. Studies were excluded if they were

conference abstracts without full-text access,

duplicate reports, or opinion pieces without primary

data.

Hirudo medicinalis is characterized by 33–34 body

segments, a brownish-black dorsal surface with six

reddish longitudinal stripes, and a cylindrical body

up to 20 cm in length. The anterior sucker bears

three jaws, each with approximately 100 teeth,

creating the characteristic Y-shaped incision on the

host's skin. A fully engorged leech may consume

5–15 mL of blood in a single feeding session of 20–

40 minutes.^[4,29]

2.3 Data Extraction and Quality Assessment :

Data were extracted independently by two

reviewers using a standardised template covering

study

intervention details, outcome measures, and key

findings. Randomised controlled trials were

design,

population

characteristics,

3.2 Jaloka Classification in Ayurveda:

assessed using the Cochrane Risk of Bias tool (RoB

2.0). Observational studies were appraised using

the Newcastle-Ottawa Scale. The level of evidence

was graded according to the Oxford Centre for

The Sushruta Samhita (Sutrasthana 13th chapter)

provides a detailed classification of leeches

(Jaloka) into two primary categories based on

therapeutic suitability: Savisha (poisonous/unfit for

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therapeutic use) and Nirvisha (non-poisonous/fit for

therapeutic use). Each category contains six sub-

types, for a total of twelve described species.^[33]

The Nirvisha group includes Kapila, Pingala,

Therapeutic

Significance

Direct thrombin inhibitor; Anticoagulation; prevention

irreversibly binds thrombin of thrombosis; post-surgical

active site (Ki ~10⁻¹³ M) flap salvage

Compound

Hirudin

Mechanism of Action

References

Markwardt, 1994 [26]; Mutschler

et al., 2016 [6]

Inhibits platelet adhesion by Prevention of platelet

binding collagen types I & aggregation; antithrombotic

II; blocks vWF interaction therapy

Schaffer et al., 2006 [5]

Eldor et al., 1996 [3]

Saratin

Calin

Inhibits von Willebrand

Antiplatelet effect: improves

factor-platelet interaction;

micro-circulation

prolongs bleeding time

Shankumukhi, Mushika,

Pundarikamukhi, and

Enhances tissue

Hydrolyzes hyaluronic acid permeability; facilitates

in the extracellular matrix diffusion of saliva

components

Baskova & Zavalova, 2001 [27]

Hyaluronidase

Savarika, identified by specific morphological and

Fibrinolytic enzyme;

dissolves fibrin cross-links fresh blood clots

Thrombolysis: dissolution of

Zavalova et al., 2000 [28]

Abdualkader et al., 2013 [5]

Nutt et al., 1988 [30]

behavioural characteristics. The Savisha group

Destabilase

Eglins

Serine protease inhibitors;

inhibit elastase, cathepsin G,

chymotrypsin

Anti-inflammatory action;

reduces tissue damage

(contraindicated

for

therapeutic

application)

Inhibit trypsin, plasmin, and Anti-inflammatory;

acrosin

Bdellins

includes Krishna, Karbura, Algarda, Indrayudha,

Samudrika, and Gochandana.^[33,15]The avoidance

of Savisha leeches is consistent with the modern

recognition that certain leech species produce

potent toxins capable of causing allergic reactions,

myalgia, fever, and even anaphylaxis.^[13]

fibrinolysis modulation

Factor Xa inhibitor;

interrupts the coagulation

cascade

Anticoagulation: potential

anti-metastatic effects

Antistasin

Vasodilatory

neurotransmitter; acts on

muscarinic receptors

Local vasodilation; pain

modulation

Eldor et al., 1996 [3]

Acetylcholine

Act on H1/H2 receptors

causing vasodilation

Increased local blood flow;

anti-inflammatory

Histamine-like

vasodilators

Sources: Markwardt, 1994 [26]; Eldor et al., 1996

[3]; Baskova & Zavalova, 2001 [27]; Mutschler et

al., 2016 [6]; Şenel et al., 2020 [7].

4. Biochemical Mechanisms Of Action :

4.1 Overview of Salivary Bioactive Compounds

The therapeutic value of medicinal leech therapy is

primarily attributable to the pharmacologically

complex saliva secreted during feeding. Current

proteomic and transcriptomic investigations have

identified more than 100 proteins in the salivary

glands of Hirudo medicinalis, with approximately

20 compounds pharmacologically characterised in

detail.^[5,6,27]These substances collectively target the

4.2Anticoagulant

Mechanisms :

and

Antithrombotic

Hirudin is the most extensively studied compound

in leech saliva and represents one of the most

potent naturally occurring thrombin inhibitors

discovered to date.^[26]Structurally, it is a 65–66

amino acid polypeptide with three disulfide bonds

and a sulfated tyrosine at position 63, which

dramatically increases its binding affinity to

thrombin. The hirudin-thrombin interaction is

stoichiometric, irreversible under physiological

conditions, and operates at a Ki of approximately

10⁻ ¹³ M — making it far more potent than heparin

at comparable concentrations.^[26,6]This interaction

coagulation

cascade,

platelet

function,

inflammatory signalling pathways, vascular tone,

extracellular matrix composition, and microbial

growth. Table 1 summarises the principal bioactive

compounds, their mechanisms, and therapeutic

significance.^{[3,5,26,27,28,30]}

prevents

fibrin

formation,

thrombin-mediated

platelet activation, and ADP release, resulting in

sustained local anticoagulation well beyond the

period of leech attachment.^[26]

Table 1. Principal Bioactive Compounds of

Medicinal

Leech

Saliva:

Mechanisms

and

Therapeutic Significance

Saratin, extracted from the saliva of H. medicinalis,

is a 103-amino acid protein that prevents platelet

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adhesion by competitively binding to collagen

types I and II, thereby blocking the collagen-von

Willebrand factor (vWF) interaction critical for

initial platelet adhesion to damaged endothelium.^[5]

Calin similarly inhibits vWF-mediated platelet

aggregation through a distinct collagen-binding

compounds in leech saliva, including acetylcholine

and histamine-like substances that modulate

sensory nociceptors.^[3]

Experimental evidence

suggests that the analgesic effects extend beyond

the immediate application period, with patients

reporting pain relief lasting weeks to months after a

single leech application in osteoarthritis trials.^[9,22]

This prolonged effect is hypothesised to involve the

modulation of substance P release, prostaglandin

mechanism.^[3]

Antistasin,

first

isolated

from

Mexican leeches (Haementeria officinalis), is a

potent Factor Xa inhibitor that interrupts the

coagulation

independent

cascade

of the

at

a

proximal

point,

synthesis,

nociceptors.^[6,22]

and

peripheral

sensitisation

of

thrombin

pathway.^[30]

Destabilase, a fibrinolytic enzyme, further dissolves

4.5

(Dosha Theory) :

According to Ayurvedic pharmacology, the primary

therapeutic action of Jalaukavacharana is

Ayurvedic

Pharmacological

Perspective

existing fibrin cross-links, contributing to

thrombolytic activity at the wound site.^[28]

4.3 Anti-Inflammatory Mechanisms:

The anti-inflammatory actions of leech saliva are

mediated primarily by eglins and bdellins, which

are serine protease inhibitors targeting elastase,

cathepsin G, and chymotrypsin — all enzymes

Raktashodhana (blood purification) and Pitta-Rakta

shamana (pacification of vitiated Pitta and Rakta

doshas). The Sushruta Samhita explicitly states that

Jalauka application is indicated in disorders of Pitta

predominance, which in contemporary terms

central

to

the

propagation

of

the

acute

inflammatory response.^[5,27]By inhibiting these

proteases, leech saliva mitigates the tissue damage

cascade that would otherwise perpetuate chronic

inflammation, particularly relevant in conditions

such as osteoarthritis, where cartilage degradation

is mediated by similar enzymes.^[9,10]Hyaluronidase,

while primarily facilitating the penetration of other

salivary components into deeper tissues, also

modulates the extracellular matrix and thus

participates in the resolution of oedema and

improvement of microcirculation.^[27]

correlates

with

inflammatory,

vascular,

and

hemorrhagic conditions.^[33,15]The sucking of

Dushita Rakta (impure blood) by the leech is

understood

as

the

removal

of

pathological

metabolic products and excess Pitta from the local

tissue, restoring Srotas (microchannels) to normal

function.^[8,33]

This

conceptual

with

framework

is

remarkably

convergent

the modern

understanding of removing stagnant, oxygen-

depleted blood and delivering bioactive molecules

that restore microvascular perfusion.^[8]

4.4 Analgesic Mechanisms :

5. Clinical Applications And Evidence Base :

5.1 Reconstructive Surgery and Flap Salvage:

The most established, FDA-cleared indication for

The painless bite characteristic of medicinal leeches

—

often

noted

by

patients

undergoing

hirudotherapy — is attributable to local anaesthetic

hirudotherapy

in

modern

medicine

is

the

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management of venous congestion in pedicled and

free flap surgery, skin grafts, digit replantation, and

ear and nose reconstruction.^[12]Venous congestion

— the accumulation of deoxygenated blood in a

surgical flap due to inadequate venous drainage —

is a major cause of post-operative flap failure.

When surgical re-anastomosis is not feasible,

medicinal leeches provide a biological bypass by

MLT to topical diclofenac for thumb-base OA,

reporting superior DASH scores in the leech group

at six weeks.^[10]These results have been supported

by retrospective cohort analyses demonstrating

sustained pain reduction and improved joint

mobility for up to 12 months following a single

leech application.^[6,22]

The proposed mechanisms for the effectiveness of

hirudotherapy in OA include: (1) local reduction of

inflammatory cytokines (IL-1β, TNF-α) through

serine protease inhibition^[5,9]; (2) improved synovial

microcirculation via vasodilatory compounds^[3]; (3)

modulation of nociceptor sensitization^[22]; and (4)

possible inhibition of matrix metalloproteinase

activity implicated in cartilage degradation.^[6]The

American Society of Hirudotherapy classifies the

evidence for knee OA as Level I–II, making it the

best-evidenced non-surgical application of MLT

outside reconstructive surgery.^[9,10]

mechanically

pharmacologically

through their antiplatelet

draining

preventing

and

congested

blood

and

reaccumulation

anticoagulant

secretions.^[12,31]

A systematic review by Herlin et al. (2017),

published in the Annales de Chirurgie Plastique

Esthétique, evaluated 277 cases of leech therapy in

flap salvage across 47 studies and reported an

overall rescue rate of approximately 70%.^[12]The

US Food and Drug Administration (FDA) formally

cleared medicinal leeches as medical devices

(510(k) K040187) for this indication, recognising

their established clinical utility.^[12]Multiple case

5.3 Chronic Low Back Pain :

Hohmann et al. (2018) published in the Deutsches

Ärzteblatt International the first RCT examining

leech therapy for chronic low back pain (CLBP).

The trial demonstrated statistically significant

reductions in pain intensity and improvements in

physical function and quality of life measures in the

leech therapy group compared to controls.^[11]

Although the sample size was modest and blinding

was methodologically challenging, this study was

series

from

tertiary plastic

surgery centres

worldwide corroborate these findings, establishing

hirudotherapy as the standard of care for surgically

uncorrectable venous congestion.^[12,31]

5.2 Osteoarthritis :

Osteoarthritis (OA) represents the most extensively

studied non-surgical application of hirudotherapy in

the modern evidence base. Michalsen et al. (2003)

conducted the first RCT comparing leech therapy to

topical diclofenac in patients with knee OA,

demonstrating significantly greater pain reduction

(VAS scale) in the leech group at four weeks post-

treatment.^[9]Andereya et al. (2008) subsequently

replicated these findings in an RCT comparing

notable

for

applying

modern

clinical

trial

methodology to hirudotherapy and provides the

primary evidence base for this indication.^[11]

5.4 Varicose Veins and Chronic Venous

Insufficiency:

Multiple observational studies and case series

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support the use of hirudotherapy in chronic venous

insufficiency (CVI) and uncomplicated varicose

A 2025 case report published in PubMed described

the successful management of thrombophlebitis

(correlated with Raktaja Shotha in Ayurveda) using

Jalaukavacharan at the site of peripheral IV

cannula phlebitis, with rapid resolution of pain,

erythema, and swelling within 24 hours.^[25]

veins.^[8,22]

The

anti-inflammatory

and

anti-

coagulant properties of leech saliva address the

underlying venous wall pathology, endothelial

activation,

and

microvascular

thrombosis

characteristic of CVI. Clinical reports describe

reductions in limb edema, skin pigmentation

changes, pain, and night cramps following leech

application along affected venous distributions.^[8]

Singh and Rajoria (2020) noted these applications

in their comprehensive review of Ayurvedic and

biomedical overlap in MLT, describing that both

Western and Ayurvedic practitioners employ leech

therapy along varicose vein distributions with

reported clinical benefit.^[8]

Ophthalmological

applications

also been

of

Jalaukavacharana

have

reported,

including management of recurrent anterior uveitis

(Raktaja Adhimantha) and herpes zoster

ophthalmicus, where the proposed mechanism

involves interruption of exosomal pathways of viral

dissemination.^[8,35]

Table 2. Summary of Clinical Evidence for

Hirudotherapy

Disease Conditions

Study Type /

and

Jalaukavacharana

Across

Clinical Condition

Key Findings

Level of Evidence

Level II–III; Strong

5.5 Applications in Jalaukavacharana (Ayurvedic

Context) :

Reference

Flap rescue rate ~70%;

standard of care in

reconstructive surgery

Venous congestion / Flap Systematic review (Herlin

et al., 2017) [12]

salvage

Significant pain reduction

(WOMAC/VAS) at 4–12

weeks; comparable to

diclofenac

RCT (Michalsen et al.,

Knee Osteoarthritis 2003) [9]; RCT (Andereya

et al., 2008) [10]

Level I–II; Moderate-Strong

The

Jalaukavacharana

literature

indexed

in

Significant reduction in pain

intensity; improved quality of

life

RCT (Hohmann et al.,

Chronic Low Back Pain

PubMed documents a considerably broader range

of indications than the biomedical evidence base,

reflective of the holistic disease classification in

Ayurveda. Bhagat et al. (2012) published a clinical

study in the journal Ayu (indexed in PubMed)

demonstrating significant relief in pain and

bleeding in thrombosed external haemorrhoids

following Jalaukavacharana, with results superior

to conservative management.^[16]Andhey et al.

(2016) reported improvement in PASI (Psoriasis

Area and Severity Index) scores in a case study of

scalp psoriasis treated with Jalaukavacharana.^[17]

Yadav and Guguloth (2017) documented hair

regrowth in a patient with alopecia (Khalitya)

treated with leech therapy alongside supportive

Ayurvedic interventions.^[19]

Level II; Moderate

Level III; Moderate

Level IV; Preliminary

Level III–IV; Moderate

2018) [11]

Reduced edema, pain, skin

changes; improved venous

microcirculation

Observational studies; case

Varicose Veins / CVI

series [8,22]

Rapid relief in swelling and

pain; improved perfusion

within 24 hours

Case report (Yadav, 2025)

[25]

Thrombophlebitis

Clinical trials; case series Reduction in joint pain and

(Singh & Rajoria, 2020) inflammation; Pitta disorder

[8] management

Osteoarthritis

(Jalaukavacharana)

Case study (Andhey et al., Improvement in PASI score;

2016) [17] reduced scaling and erythema

Scalp Psoriasis

Hemorrhoids

Level IV; Preliminary

Level II; Moderate

Clinical trial (Bhagat et al., Significant relief in pain and

2012) [16]

bleeding in thrombosed piles

All 13 cases reported clinical

improvement across various

urological indications

Systematic review

(Marufov et al., 2023) [21]

Urological conditions

Alopecia (Khalitya)

Level IV; Preliminary

Observed hair regrowth after

Jalaukavacharana with herbal

support

Case report (Yadav &

Guguloth, 2017) [19]

RCT = Randomised Controlled Trial; WOMAC =

Western Ontario and McMaster Universities

Osteoarthritis Index; VAS = Visual Analogue

Scale; PASI = Psoriasis Area Severity Index.

5.6

Dermatological

and

Wound

Healing

Applications :

Leech therapy has been investigated as an adjunct

treatment for chronic venous ulcers, diabetic

wounds,

and

inflammatory

dermatological

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conditions.^[23,29]The multimodal mechanism —

indication), tinnitus, acute and chronic otitis media,

priapism, penoscrotal oedema, and myasthenia

gravis.^[32,34]A systematic review of urological

applications (Marufov et al., 2023) found that all 13

cases reviewed reported clinical improvement, with

hirudotherapy applied successfully for penile

replantation, scrotal hematoma, neonatal bladder

exstrophy repair, and penoscrotal oedema.^[21]These

applications underscore the versatility of the leech's

pharmacological toolkit when applied to local

venous congestion and inflammatory processes

across diverse anatomical regions.^[4,31]

combining mechanical debridement, antimicrobial

effects

from

salivary

peptides,

improved

microcirculation, and anti-inflammatory action —

creates a conducive environment for wound

healing.^[5,6]Clinical studies conducted in the

context of Unani medicine (a related traditional

system) have documented healing of poorly

managed diabetic wounds using hirudotherapy in

combination

with

blood-purifying

herbal

formulations.^[4]Dermatological conditions such as

eczema, furunculosis, and acne have been treated in

traditional European and Russian hirudotherapy

centres, though controlled evidence for these

applications remains sparse.^[23]

6.Safety

Complications :

6.1 Infectious Complications:

Profile,

Contraindications,

And

The most clinically significant complication of

hirudotherapy is bacterial infection, primarily

caused by Aeromonas spp. — gram-negative,

facultatively anaerobic bacteria that inhabit the

gastrointestinal tract of medicinal leeches as

5.7 Cardiovascular and Thrombotic Conditions

Historical and contemporary evidence support the

use

of

MLT

in

various

thrombotic

and

cardiovascular conditions, including deep vein

thrombosis,

post-phlebitic

syndrome,

and

symbiotic

digestive

partners.^[13,24]

Aeromonas

hypertension,

though modern

anticoagulant

hydrophila and Aeromonas veronii biotype sobria

are the most frequently implicated species. These

bacteria are invariably introduced into the bite

wound during leech feeding and may cause local

wound infections, cellulitis, necrotising fasciitis,

pharmacotherapy has largely supplanted leech

therapy for these systemic conditions.^[3,4]The

interest in hirudin as a pharmacological scaffold

has led to the development of recombinant hirudin

analogues (lepirudin, desirudin, bivalirudin) that

are now in clinical use as direct thrombin inhibitors

septicemia,

or

pneumonia,

particularly

in

immunocompromised hosts.^[13]The incidence of

clinically significant Aeromonas infection in

published case series ranges from 2% to 36%, with

for

anticoagulation

in

heparin-induced

acute coronary

thrombocytopenia

syndromes.^[26,6]

and

higher

rates

in

patients

therapy.^[13,24]

receiving

critical

immunosuppressive

A

5.8 Other Traditional Applications :

PubMed-indexed reviews of the MLT literature

pharmacological consideration is that Aeromonas

strains are inherently resistant to beta-lactam

antibiotics, including amoxicillin-clavulanate and

document additional applications, including

glaucoma (officially recognised in Russia and

Eastern Europe as classical alternative

a

second-generation

cephalosporins,

due

to

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constitutive

beta-lactamase

guidelines

production.^[13]

recommend

been

documented

and

may be

Evidence-based

sensitisation to leech salivary proteins upon

prophylactic administration of fluoroquinolones

repeated

exposures.^[13,29]

Practitioners

should

(ciprofloxacin), third-generation cephalosporins,

maintain emergency anaphylaxis management

protocols and conduct careful screening for known

allergies to leech-derived products.^[13]

trimethoprim-sulfamethoxazole,

or

aminoglycosides commencing at the onset of

hirudotherapy and continuing for at least five days

after the final leech application.^[13,24]Management

protocols published by institutions in France

emphasise the necessity of an institutional standard

operating procedure governing the entire leech

6.4 Contraindications:

Absolute

contraindications

to

hirudotherapy

inherited

include:

haemophilia and

other

coagulopathies; severe anaemia (haemoglobin < 8

g/dL); active anticoagulant therapy; known allergy

management

disposal.^[24]

pathway

from

receipt

through

to

leech

products;

leukaemia

and

other

haematological malignancies; arterial disease with

inadequate perfusion; and pregnancy.^[13,14]Relative

contraindications include immunosuppression (risk

of severe Aeromonas infection), sites overlying

large arteries, cachexia, and hypotension.^[13]In the

Ayurvedic framework, Sushruta describes specific

contraindications (Nishiddha Desha) that include

areas over great vessels, lymph nodes, nipples,

umbilicus, axilla, groin, and joints — observations

that align closely with modern safety protocols.^[33]

6.2 Haemorrhagic Complications:

Prolonged bleeding from leech bite wounds

is expected and is pharmacologically desirable in

the therapeutic context; however, excessive or

systemic blood loss can constitute a clinically

significant

complication.

The

sustained

anticoagulant effect of hirudin and other salivary

compounds may result in bleeding that persists for

10–30 hours following leech detachment.^[13,26]

Patients

undergoing

intensive

hirudotherapy

6.5 Rare Complications:

Rare but reported complications of MLT include:

courses with multiple leeches applied several times

daily may develop clinically significant anaemia

requiring blood transfusion.^[13]Close monitoring of

haemoglobin levels is essential during prolonged

MLT courses, and some institutions establish a

minimum haemoglobin threshold (e.g., 8 g/dL)

below which hirudotherapy is suspended.^[12,24]

leech

migration

beneath

surgical

flaps

(necessitating duplex ultrasound localisation and

minimal access removal); scarring at bite sites;

transmission of blood-borne pathogens between

patients if leeches are reused (addressed by the use

of

single-use,

farm-raised

leeches);

and

psychological

distress in

phobia-prone

6.3 Allergic Reactions:

Local hypersensitivity reactions — including

patients.^[13,24]Leeches are classified as single-use

biological medical devices in most regulatory

pruritus, urticaria, and contact dermatitis — at

leech attachment sites are relatively common.

Systemic anaphylactic reactions, while rare, have

frameworks;

reuse

is

absolutely

contraindicated.^[12,24]

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7. Procedure: Jalaukavacharana And Modern

Protocol :

7.1 Ayurvedic Procedural Guidelines:

The procedural methodology for Jalaukavacharana

suppliers are used.^[12,24]Leeches are stored in clean,

oxygenated water and must not come into contact

with chemicals or antiseptics that would deter

feeding. The target site is cleansed without

antiseptics.^[24]Standard protocols apply 2–6 leeches

per session, with sessions repeated every four to

is described in considerable operational detail in the

Sushruta

Samhita.

Pre-procedural

preparation

(Purvakarma) involves smearing the affected area

with substances attractive to leeches (e.g., mud or

blood). The leech is placed on the site, covered

with a moist cloth, and allowed to attach.

Successful attachment is confirmed by the arching

of the leech's body.^[33,15]The leech is permitted to

feed until it spontaneously detaches, signifying

satiation. Premature removal is performed if the

patient reports increased pain or burning, indicating

sucking of pure (healthy) blood. Post-application

(Paschatakarma) involves pressing the wound site

eight

prophylactic antibiotics commencing at the start of

therapy. Haemoglobin and haematocrit are

hours

as

required.

Patients

receive

monitored in patients undergoing extended MLT

courses.^[12,13,24]Following feeding, leeches are

disposed of as biological medical waste in

accordance with institutional infection control

policies and national regulations; reuse between

patients is strictly prohibited.^[24]

8. Discussion :

This review demonstrates that hirudotherapy

to

evacuate

remaining

blood

and

applying

appropriate wound management. The feeding leech

should be induced to detach by applying salt or

turmeric on its posterior sucker.^[33]

occupies

a

well-defined,

pharmacologically

validated position in the contemporary therapeutic

landscape, while simultaneously representing one

of the most historically continuous therapeutic

practices in human medicine.^[1,2,3]The transition

Leech selection, according to Ayurvedic texts,

requires preference for specimens that are neither

too large nor too small, actively mobile, inhabiting

clean water, and free of visible pathology. Storage

requires chlorinated or clean water at 15–20°C,

with a ratio of approximately two leeches per 250

mL of water. Direct sunlight exposure is avoided,

and water is changed every five to six days.^[15,33]

These storage guidelines bear close functional

similarity to modern protocols for maintaining

farm-raised medicinal leeches.^[24]

from

its

ancient

Ayurvedic

codification

as

Jalaukavacharana to an FDA-cleared medical

device in the 21st century is remarkable and

underscores

observations

the

in

principle

that

empirical

when

traditional

medicine,

subjected to rigorous mechanistic investigation, can

yield scientifically validated treatments.^[8,12,33]

The scientific evidence base for MLT is strongest

in the domain of surgical flap salvage, where it

functions as the standard of care for venous

congestion when surgical revision is not feasible.^[12]

The evidence for knee osteoarthritis is moderate-to-

strong, supported by multiple RCTs demonstrating

7.2 Modern Clinical Protocol :

In contemporary clinical practice, only farm-raised,

pathogen-screened Hirudo medicinalis or H.

verbana obtained from licensed commercial

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clinically meaningful pain reduction that is

comparable or superior to topical anti-inflammatory

treatment^[9,10]— a finding of particular practical

importance given the limited pharmacological

options for patients who are poor surgical

candidates or who have contraindications to oral

NSAIDs.^[11,22]

Several methodological challenges characterise the

hirudotherapy research landscape. Blinding of

patients and practitioners is inherently difficult,

limiting the quality of RCTs.^[9,11]Sample sizes in

most clinical studies are small. Standardisation of

leech species, number of applications, session

frequency, and duration varies considerably across

studies, limiting comparability.^[7]The management

of Aeromonas infection risk has evolved from

reactive to prophylactic protocols, but institutional

guidance remains heterogeneous without universal

international consensus guidelines.^[13,24]Future

research should prioritise large-scale, multi-centre

A central finding of this review is the remarkable

degree of convergence between the Ayurvedic

indications

for

Jalaukavacharana

and

the

applications investigated in modern biomedicine.

Conditions classified in Ayurveda as Pitta-Rakta

disorders — encompassing inflammatory joint

diseases, hemorrhagic conditions, inflammatory

skin diseases, and vascular disorders — map

RCTs

with

standardised

protocols;

the

development of validated placebo controls; and

systematic pharmacokinetic profiling of leech

saliva compounds in human subjects.^[7,22]

consistently onto

the

conditions

for

which

hirudotherapy has

demonstrated

benefit

in

biomedical studies.^[8,33]This convergence suggests

that the ancient Ayurvedic physicians, through

centuries of systematic empirical observation, had

identified a valid therapeutic principle that modern

molecular pharmacology has only recently been

able to explain.^[8,15]

The

integration

of

Jalaukavacharana

into

evidence-based Ayurvedic practice represents a

particularly compelling opportunity. The existing

PubMed literature, while growing, predominantly

consists of case reports and small observational

studies for the Ayurvedic applications.^{[8,15,16,17,19]}

Investment in prospective clinical trials registering

on CTRI (Clinical Trials Registry of India) for

conditions such as Gridhrasi (sciatica), Vatarakta

(gout), and Kushtha (dermatological conditions)

would substantially advance the evidence base and

facilitate the recognition of Jalaukavacharana

A scientometric analysis of the hirudotherapy

literature by Şenel et al. (2020) identified 834

PubMed-indexed articles on hirudotherapy as of

their search date, with the USA being the leading

contributor (280 publications) followed by the UK,

Germany, and France. Peak publication activity

occurred in 2011, with a gradual but consistent

within

integrative

medicine

frameworks

growth

in

publications

thereafter.^[7]

This

globally.^[8,35]

bibliometric profile is consistent with a maturing

evidence base that has expanded from initial

surgical case reports to include clinical trials,

systematic reviews, and molecular investigations.^[7]

9. Conclusion :

Hirudotherapy, medicinal leech therapy, and

Jalaukavacharana represent convergent

expressions of a single, biologically rational

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therapeutic principle that has been independently

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over

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The

pharmacological basis of therapy — rooted in the

rich salivary biochemistry of medicinal leeches —

is now substantially elucidated, with more than 100

bioactive compounds identified that modulate

coagulation, inflammation, pain, and microvascular

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hirudotherapy as the standard of care for venous

congestion in reconstructive surgery,^[12]as a

clinically effective treatment for knee and hand

osteoarthritis,^[9,10]and as a promising adjunct in a

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