Drug & supplement interaction

Lousewort + Warfarin Sodium

Warfarin Sodium brand names: Coumadin, Panwarfin, Sofarin.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Lousewort and Warfarin Sodium 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.

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Interaction report

Lousewort and Warfarin Sodium

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 Warfarin Sodium and Lousewort 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 Lousewort at all — not against Warfarin Sodium, 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.

Lousewort safety at a glance

Lousewort overall Not established Human safety data are very limited, and some Pedicularis species may contain potentially toxic alkaloids.
Pregnancy Avoid No reliable safety data exist, so it should be avoided during pregnancy.
Breastfeeding Avoid No safety information is available, so it is best avoided while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Warfarin Sodium and Lousewort? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Warfarin Sodium’s Own FDA Label Lists

This is not an interaction — none of it involves Lousewort. These are the most notable effects listed in the ADVERSE REACTIONS section of Warfarin Sodium’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 5 of them are worth acting on rather than waiting out — marked below.

  • Kidney problems Worth acting on
  • Hives Worth acting on
  • Liver problems Worth acting on
  • Bleeding or bruising Worth acting on
  • An allergic reaction Worth acting on
  • Chills
  • Bloating or gas
  • Hair loss
  • Itching
  • Stomach pain

Showing the 10 most notable of 14 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Warfarin Sodium. Read the label on DailyMed › Where a percentage is shown, it is the share of 45,853 voluntary FDA FAERS reports for Warfarin Sodium that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Lousewort’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Lousewort side to compare — that is a limit of the record, not a statement that Lousewort has no side effects.

From our Q&A

Questions About Lousewort or Warfarin Sodium

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

This page covers Lousewort only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Warfarin Sodium page lists 361 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Alfalfa (major), American Ginseng (major), Beer (major) and Cannabis (major).

Open the Warfarin Sodium interaction page

How much people look this up

Where Lousewort and Warfarin Sodium 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 Lousewort
Steady interest

#1,240 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Warfarin Sodium
Top 1%

#23 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. Lousewort is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Lousewort reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Lousewort and Warfarin Sodium records this page draws on were last updated June 22, 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 Lousewort

What is Lousewort?

  • Muscle relaxation
  • Sleep and relaxation
  • Mild pain relief
  • Stress and tension

Lousewort refers to several plants in the Pedicularis genus, traditionally used as a mild muscle relaxant and calming herb. There is very little scientific research on its safety or effectiveness in humans, and some species may contain toxic compounds, so caution is strongly advised.

Pedicularis spp. · Orobanchaceae · Aerial parts (flowers, leaves, and stems) · Tea, tincture, dried herb, capsules, smoking blends

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

Lousewort: dosing

There is no established standard dose for lousewort. Traditional use varies widely, and no clinical studies have determined a safe or effective amount.If you choose to use a product, follow the directions on the label and start with the lowest suggested amount.

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

Read the full Lousewort monograph & all interactions
Medication

About Warfarin

What Is Warfarin Used For?

Brand names: Coumadin, Panwarfin, Sofarin

Warfarin helps prevent and treat harmful blood clots. The label lists these uses for both Warfarin Sodium tablets and Jantoven tablets:

  • Preventing and treating venous thrombosis (clots in the veins) and pulmonary embolism (clots in the lungs).
  • Preventing and treating clot-related complications of atrial fibrillation and/or heart valve replacement.
  • Lowering the risk of death, another heart attack, and clot-related events such as stroke after a heart attack.

Warfarin does not dissolve a clot that has already formed. It helps stop the clot from growing and prevents further clot-related complications.

Most-Reported Side Effects for Warfarin Sodium

From FAERS, the FDA’s public side-effect reporting system (0 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

International normalised ratio increased 5,091 reports
Dyspnea 2,536 reports
Fatigue 2,096 reports
Nausea 2,080 reports
Diarrhea 1,885 reports
See full Warfarin drug information
Keep checking

Other Drugs & Lousewort

Browse every other medication we’ve checked against Lousewort — 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 Lousewort 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 Lousewort list.

See the full Lousewort interactions page
See every supplement checked against Warfarin Sodium, ranked by severity
Evidence & sources

Lousewort References

The 1 sources that drive our Lousewort monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Lousewort is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Using Dietary Supplements Wisely — NIH NCCIH Source

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 Lousewort and Warfarin Sodium Together: Common Questions

Is it safe to take Lousewort with Warfarin Sodium?
We do not list a known interaction between Lousewort and Warfarin Sodium. 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.
Does Warfarin Sodium interact with any supplements?
Yes. Warfarin Sodium has documented interactions with 361 supplements in our database — Lousewort is not one of them. The Warfarin Sodium 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

Lousewort monograph Uses, safety profile, and every drug interaction in one place Warfarin drug information The full plain-English guide to this medication Warfarin Sodium supplement interactions Every supplement checked against Warfarin Sodium, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Warfarin Sodium and Lousewort?

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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.