Drug & supplement interaction

Black Bryony + Rivaroxaban

Rivaroxaban brand name: Xarelto.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Black Bryony and Rivaroxaban in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Black Bryony and Rivaroxaban

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Rivaroxaban and Black Bryony in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Black Bryony at all — not against Rivaroxaban, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Black Bryony safety at a glance

Black Bryony overall Avoid The plant contains irritant and toxic compounds and can cause poisoning, so it is generally best avoided.
Pregnancy Unsafe When used orally. All parts of the black bryony plant are considered poisonous. Read the full pregnancy detail
Breastfeeding Unsafe When used orally. All parts of the black bryony plant are considered poisonous. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Rivaroxaban and Black Bryony? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Black Bryony and Rivaroxaban May Share a Side Effect

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Vomiting Additional detail

    Black Bryony

    “Orally, all parts of the black bryony plant are considered poisonous due to its saponin content. Black bryony has been reported to cause severe gastrointestinal irritation, vomiting, diarrhea, seizures, respiratory failure, and kidney failure (18). Topically, black bryony has been reported to cause contact dermatitis.”

    Black Bryony · Natural Medicines adverse-effect record, reported in dermatitis.

    4 sources cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
    2. 3829. Schmidt RJ, Moult SP. The dermatitic properties of black bryony (Tamus communis L.). Contact Dermatitis 1983;9:390-6.
    3. 35781. Kashchenko, V. B. and Kozhukhar', G. S. [Toxidermia caused by Tamus communis]. Vestn.Dermatol.Venerol. 1986;(5):50-51.
    4. 35782. Miliavskii, A. I. [Contact dermatitis caused by black bryony]. Vestn.Dermatol.Venerol. 1979;(7):49-50.

    “Orally, black bryony has been reported to cause severe mouth, pharyngeal, and gastrointestinal irritation. It has also been reported to cause vomiting and diarrhea (18).”

    Black Bryony · Natural Medicines adverse-effect record, reported in diarrhea.

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

    Rivaroxaban

    Listed in the ADVERSE REACTIONS section of the FDA label for Rivaroxaban. Read the label on DailyMed ›

Reported for Black Bryony but not commonly for Rivaroxaban: kidney problems, a skin rash, diarrhea and seizures.

Effects for Rivaroxaban come from the ADVERSE REACTIONS section of its FDA label; effects for Black Bryony come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 205,037 voluntary FDA FAERS reports for Rivaroxaban that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Black Bryony in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally. All parts of the black bryony plant are considered poisonous.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

From our Q&A

Questions About Black Bryony or Rivaroxaban

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Black Bryony or Rivaroxaban, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Rivaroxaban

This page covers Black Bryony only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Rivaroxaban page lists 285 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Danshen (major), Grapefruit (major), Piracetam (major) and St. John's Wort (major).

By severity: 5 major · 240 moderate · 40 minor.

From our pharmacist’s overview on the Rivaroxaban page

“Grapefruit is the interaction I would flag first for anyone taking rivaroxaban (Xarelto). It slows how the body clears this blood thinner, and higher levels mean more bleeding risk.”

Reviewed by 2 · Jul 18, 2026

Open the Rivaroxaban interaction page

How much people look this up

Where Black Bryony and Rivaroxaban Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Black Bryony
Steady interest

#797 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Rivaroxaban
Top 10

#10 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Black Bryony reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Black Bryony and Rivaroxaban records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Black Bryony

What is Black Bryony?

Black Bryony
  • Bruises and sprains (applied to the skin)
  • Joint and muscle pain
  • Chilblains
  • Rheumatic complaints
  • Skin and folk "healing" remedies

Black Bryony is a toxic climbing plant whose root has been used in folk medicine, mostly applied to the skin for bruises and aches. There is little to no reliable scientific evidence that it works, and it can cause serious poisoning if swallowed or severe irritation on the skin. Because of these real risks, it is best avoided, especially without guidance from a healthcare professional.

Dioscorea communis · Dioscoreaceae · Root (tuber); occasionally berries and aerial parts (all considered toxic) · Traditional poultices and ointments for external use; rarely sold as a modern supplement

An interaction check asks whether these two react with each other — it does not ask whether Black Bryony is a good idea for someone in your situation. Here is what our Black Bryony record says about it on its own.

Black Bryony: dosing

There is no established safe dose for Black Bryony. It has not been studied well enough to recommend any amount, and because it is toxic, no standard dose exists for taking it by mouth.If you ever encounter a product that contains it, do not assume it is safe. Given the risks, the safest approach is not to use it at all.

From our Black Bryony monograph — the full record covers uses, side effects and every documented interaction.

Read the full Black Bryony monograph & all interactions
Medication

About Rivaroxaban

What Is Rivaroxaban Used For?

Brand name: Xarelto

Rivaroxaban tablets are used to reduce the risk of stroke in adults with nonvalvular atrial fibrillation (an irregular heart rhythm), treat deep vein thrombosis (DVT, a blood clot in a vein) and pulmonary embolism (PE, a blood clot in the lungs), and lower the chances of these clots coming back. They also help prevent clots after hip or knee replacement surgery, protect hospitalized patients at risk for clots, and — in combination with aspirin — reduce the risk of major cardiovascular events in adults with coronary artery disease (CAD) or peripheral artery disease (PAD).

Rivaroxaban tablets are also approved for treating VTE (venous thromboembolism, blood clots in veins) and preventing recurrence in pediatric patients from birth to under 18 years, and for preventing clots in children aged 2 and older with congenital heart disease after the Fontan procedure. Rivaroxaban for oral suspension (available as Rivaroxaban Granule and Xarelto oral suspension) is specifically indicated for these two pediatric uses.

See full Rivaroxaban drug information
Keep checking

Other Drugs & Black Bryony

Browse every other medication we’ve checked against Black Bryony — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Black Bryony against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Black Bryony list.

See the full Black Bryony interactions page
See every supplement checked against Rivaroxaban, ranked by severity
Evidence & sources

Black Bryony References

The 4 references that drive our Black Bryony monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  2. Schmidt RJ, Moult SP. The dermatitic properties of black bryony (Tamus communis L.). Contact Dermatitis 1983;9:390-6.
  3. Kashchenko, V. B. and Kozhukhar', G. S. [Toxidermia caused by Tamus communis]. Vestn.Dermatol.Venerol. 1986;(5):50-51.
  4. Miliavskii, A. I. [Contact dermatitis caused by black bryony]. Vestn.Dermatol.Venerol. 1979;(7):49-50.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Black Bryony and Rivaroxaban Together: Common Questions

Is it safe to take Black Bryony with Rivaroxaban?
We do not list a known interaction between Black Bryony and Rivaroxaban. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Black Bryony and Rivaroxaban have any of the same side effects?
Yes — our sources link each of them separately to one of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Does Rivaroxaban interact with any supplements?
Yes. Rivaroxaban has documented interactions with 285 supplements in our database — Black Bryony is not one of them. The Rivaroxaban interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Black Bryony monograph Uses, safety profile, and every drug interaction in one place Rivaroxaban drug information The full plain-English guide to this medication Rivaroxaban supplement interactions Every supplement checked against Rivaroxaban, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Rivaroxaban and Black Bryony?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.