Hirudotherapy Drug Interactions, Uses, Side Effects & More

Interaction report

Drugs that interact with Hirudotherapy

0 medications have a known interaction with Hirudotherapy, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Hirudotherapy. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Hirudotherapy combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Monograph

Hirudotherapy: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Hirudotherapy is the medical use of living leeches placed on the skin to draw blood and release saliva compounds that thin blood and ease congestion. It has a real, accepted role in some surgical settings (such as saving reattached fingers or skin flaps), but evidence for most other uses is limited. It should only be done by trained professionals because of risks of infection and bleeding.

Scientific name: Hirudo medicinalis
Family: Hirudinidae
Part used: Whole living medicinal leech (and its saliva)
Common forms: Live medicinal leeches applied to the skin by a trained practitioner

People commonly use it for

Reconstructive and plastic surgery (relieving blood congestion in reattached tissue)
Osteoarthritis and joint pain
Circulation problems
Varicose veins
Traditional treatment for various inflammatory conditions

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Should only be performed by trained practitioners using medical-grade leeches due to infection and bleeding risks.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid use.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid use.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Hirudotherapy is the practice of placing living medicinal leeches on the skin for a health purpose. The most commonly used species is Hirudo medicinalis, often called the medicinal leech. When a leech attaches, it makes a small bite and feeds on blood while releasing saliva that contains substances that prevent clotting.

Leeches have been used in medicine for thousands of years across many cultures. Today, medical-grade leeches are raised in special facilities and are used in hospitals for specific situations, especially in plastic and reconstructive surgery. Outside of those settings, leech therapy is also offered in some traditional and alternative medicine practices for a wider range of conditions.

How it works

When a leech feeds, its saliva releases a mix of active compounds. The best known is hirudin, a natural substance that blocks clotting and helps keep blood flowing. Other compounds may widen blood vessels, reduce the body's ability to form clots, and possibly numb the bite area.

In surgery, this combination helps drain congested blood from tissue that does not yet have good vein drainage, giving the tissue time to heal. Researchers also think these compounds may have anti-inflammatory and blood-thinning effects that could explain proposed benefits for pain and circulation.

Many of these mechanisms come from laboratory studies of leech saliva. While the blood-thinning effect is well established, the broader benefits people claim are not fully proven in humans.

Effectiveness

Does Hirudotherapy work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 5 uses evaluated

1 Likely effective 1 Possibly effective 3 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Likely Effective Skin grafts