Drug & supplement interaction

Groundsel + Rifampin

Rifampin brand names: Rifadin, Rimactane, Rifadin Injection, Rofactor.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Groundsel has a moderate interaction with Rifampin. Theoretically, taking CYP3A4 inducers with groundsel might increase the risk of pyrrolizidine alkaloid toxicity, such as hepatotoxicity.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Groundsel and Rifampin

Here is the interaction we found between these two, with the evidence behind it.

Moderate

CYTOCHROME P450 3A4 (CYP3A4) INDUCERS

Why this applies to Rifampin

Rifampin falls under CYTOCHROME P450 3A4 (CYP3A4) INDUCERS — the group Groundsel interacts with.

Theoretically, taking CYP3A4 inducers with groundsel might increase the risk of pyrrolizidine alkaloid toxicity, such as hepatotoxicity.
Pyrrolizidine alkaloids, constituents of groundsel, are converted to toxic metabolites by CYP3A4.
Severity Moderate Likelihood Possible Evidence D

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

First things first: I really don't recommend taking groundsel at all. It contains pyrrolizidine alkaloids that can seriously hurt your liver, and there's no good proof it helps anything. Here's the wrinkle with rifampin specifically. Rifampin is a powerful inducer, meaning it revs up a liver enzyme called CYP3A4. That same enzyme is what turns groundsel's alkaloids into their toxic, liver-damaging form.

So in theory, pairing the two could ramp up that conversion and raise your risk of liver injury. Rifampin already stresses the liver on its own (it can cause yellowing skin or eyes, dark urine, and belly pain), so I'd hate to add another liver burden. To be fair, this concern comes only from lab and animal data, not human studies, so it's theoretical. Still, skip the groundsel and check with your doctor or pharmacist.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Chojkier M. Hepatic sinusoidal-obstruction syndrome: toxicity of pyrrolizidine alkaloids. J Hepatol 2003;39:437-46. PubMed
  2. Wang YP, Yan J, Fu PP, Chou MW. Human liver microsomal reduction of pyrrolizidine alkaloid N-oxides to form the corresponding carcinogenic parent alkaloid. Toxicol Lett 2005;155:411-20. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Groundsel Also Interacts With Other Medications

Groundsel has 86 moderate known drug interactions in our database — the Rifampin one above is one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. Rifampin)
Taking anything else?

Check Another of Your Medications Against Groundsel

Covers the 2,830 medications we’ve checked against Groundsel. Pick one to open its full report.

From our Q&A

Questions About Groundsel or Rifampin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Groundsel or Rifampin, 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 Rifampin

This page covers Groundsel only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Rifampin page lists 222 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Apple (major), Asarabacca (major), Beer (major) and Grapefruit (major).

By severity: 9 major · 172 moderate · 41 minor.

From our pharmacist’s overview on the Rifampin page

“Rifampin (Rifadin) is the backbone of tuberculosis treatment, taken daily for months, which is plenty of time to pick up a juice habit or a probiotic without a second thought. With 222 supplement and food entries on file and 9 rated major, this list calls for real care, starting with the majors.”

Reviewed by 2 · Jul 18, 2026

Open the Rifampin interaction page

How much people look this up

Where Groundsel and Rifampin 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 Groundsel
Steady interest

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

29 days ago today
Medication Rifampin
Top half

#762 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.

Supplement

About Groundsel

What is Groundsel?

  • Menstrual complaints
  • Digestive upset
  • Minor wounds (topical)
  • Sore gums or mouth
  • Mild aches

Groundsel is a common weed traditionally used as a folk remedy, but it contains pyrrolizidine alkaloids that can cause serious liver damage. There is no reliable evidence that it works for any condition, and most health authorities consider it unsafe to take internally. We do not recommend using it.

Read the full Groundsel monograph & all interactions
Medication

About Rifampin

What Is Rifampin Used For?

Brand names: Rifadin, Rimactane, Rifadin Injection, Rofactor

Rifampin treats all forms of tuberculosis. It is always used as part of a combination of TB medicines, not on its own.

It also treats asymptomatic meningococcal carriers. These are people who carry the bacteria Neisseria meningitidis in the nose and throat without being sick. Rifampin is not used to treat an actual meningococcal infection.

Rifampin capsules are taken by mouth. Rifadin IV and Rifampin for Injection are given through a vein for the initial treatment and retreatment of tuberculosis when the medicine cannot be taken by mouth.

See full Rifampin drug information
Keep checking

Other Drugs & Groundsel

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

0Major
86Moderate
0Minor
2,743No known interaction
86 Moderate 2,743 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Groundsel page.

No interaction 2,743 drugs checked — show the list

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

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full Groundsel list.

See the full Groundsel interactions page
See every supplement checked against Rifampin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Groundsel monograph › Uses, safety, and every drug interaction in one place Rifampin supplement interactions › Every supplement checked against Rifampin, ranked by severity Rifampin drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Groundsel and Rifampin Together: Common Questions

Can you take Groundsel with Rifampin?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Groundsel and Rifampin interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Rifampin and Groundsel?

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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.