Herb & supplement monograph

Papain Drug Interactions, Uses, Effectiveness, Safety & More

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

What is this page for?

First and foremost: how Papain interacts with medications. The heart of this page is the interaction list — every drug Papain is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Papain is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Reviewed by licensed pharmacists Sourced from Natural Medicines

On this page

Papain Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Papain drug interaction appears low for most people, since this enzyme is known to interact with only a couple of medications. None of the listed interactions are rated major, and the evidence behind them is limited rather than well established.

Interactions deserving the most attention

The interaction that deserves the most attention involves warfarin, the blood thinner. In one reported case, a person who had been stable on warfarin developed a markedly elevated INR, a measure of blood-thinning effect, after taking a supplement containing papain from papaya extract. Because warfarin is a narrow-margin medicine where even small changes can raise bleeding risk, anyone taking it should treat this combination with caution even though the evidence comes from a single report.

What the rest of the list means

Unlike many supplements, papain has a very short interaction list, so most medications are not expected to be affected. Keep in mind that the concerns here rest on theory and one case report rather than controlled human studies, so the true size of the effect is not well defined.

Check your medications against Papain

Based on HelloPharmacist’s Papain interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Papain

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

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Papain using our pharmacist-reviewed interaction data.

AI summaries are generated from our Papain interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

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 Papain combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Papain affects

Every type of medication (drug category) Papain is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Papain interacts with

Warfarin (coumadin)

Warfarin (Coumadin)

Theoretically, papain might increase the effects and side effects of warfarin.
In one case report, a patient previously stable on warfarin was found to have an international normalization ratio (INR) of 7.4, which was attributed to ingestion of a supplement containing papain from papaya extract.

Likelihood Possible Evidence D

Monograph

Papain: Uses, Safety & Side Effects

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

The bottom line

Papain is a protein-digesting enzyme from the papaya plant that is used in digestive supplements and some topical products. While it has clear food and laboratory uses, strong human evidence for most health claims is limited, and it can cause allergic reactions or throat irritation. Check with a pharmacist or doctor before using it, especially if you have a latex or papaya allergy.

Scientific name: Carica papaya
Family: Caricaceae
Part used: Latex (sap) from the unripe fruit; also derived from leaves
Common forms: Capsules, tablets, chewable digestive enzyme blends, topical ointments and gels, meat tenderizer powder

People commonly use it for

Digestive support for protein digestion
Wound cleaning (debridement of dead tissue)
Sore throat and inflammation
Sports injuries such as sprains
Skin conditions

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

Safety at a glance

OverallUse caution

Generally tolerated as a food, but supplements may irritate the digestive tract and cause allergic reactions.

PregnancyPossibly Unsafe

When used orally. There is some concern that crude papain is teratogenic and embryotoxic.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

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

Papain is a natural enzyme that comes from the papaya plant (Carica papaya), a tropical fruit tree grown in warm regions around the world. The enzyme is collected from the milky white sap (latex) of the unripe green papaya fruit, and it can also be found in the leaves.

Papain belongs to a group called proteolytic enzymes, which means it breaks down proteins into smaller pieces. Because of this ability, papain is used in many different ways. In the food industry it is a common meat tenderizer. In supplements, it is often added to digestive enzyme blends. It is also used in some medical and skin-care products, such as wound dressings and ointments.

How it works

Papain works by cutting the chemical bonds that hold proteins together. In simple terms, it acts like molecular scissors, breaking large proteins down into smaller peptides and amino acids.

This protein-breaking action is the reason papain can tenderize meat and may help digest proteins in food. The same ability is thought to help clean wounds by dissolving dead, protein-rich tissue.

Researchers have also studied whether papain has anti-inflammatory effects, but much of this work comes from laboratory or animal studies. How well these effects translate to real benefits in people is not well established.

Effectiveness

Does Papain work?

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

Evidence overview · 17 uses evaluated

17 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.

For Papain, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 17 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Cancer