Drug & supplement interaction

Water Germander + Tavaborole

Tavaborole brand name: Kerydin.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Water Germander and Tavaborole 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.

Know someone taking this? Share
Facebook Post Reddit Email
On this page
Interaction report

Water Germander and Tavaborole

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 Tavaborole and Water Germander 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 Water Germander at all — not against Tavaborole, 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.

Water Germander safety at a glance

Water Germander overall Avoid Oral use has been linked to serious, sometimes fatal liver damage.
Pregnancy Avoid Not safe; avoid because of liver toxicity risk and lack of safety data.
Breastfeeding Avoid Not safe; avoid due to toxicity concerns and lack of data.

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

Still wondering about combining Tavaborole and Water Germander? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Tavaborole’s Own FDA Label Lists

This is not an interaction — none of it involves Water Germander. These are the most notable effects listed in the ADVERSE REACTIONS section of Tavaborole’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. One of them is worth acting on rather than waiting out — marked below.

  • An allergic reaction Worth acting on
  • A skin rash mentioned in 9.1% of FDA reports for Tavaborole

From the ADVERSE REACTIONS section of the FDA label for Tavaborole. Read the label on DailyMed › Where a percentage is shown, it is the share of 55 voluntary FDA FAERS reports for Tavaborole that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Water Germander’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Water Germander side to compare — that is a limit of the record, not a statement that Water Germander has no side effects.

Everything else you take

See Every Supplement That Interacts With Tavaborole

This page covers Water Germander only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tavaborole page lists 3 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Dimethylsulfoxide (dmso) (moderate), Turpentine Oil (moderate) and Alchemilla (minor).

By severity: 2 moderate · 1 minor.

From our pharmacist’s overview on the Tavaborole page

“Tavaborole (Kerydin) is a solution you paint onto the toenail for fungal infections, and its supplement concerns stay right where you apply it. Only three ingredients have interactions on file, two rated moderate and one minor, and every one involves putting something else on the skin.”

Reviewed by 2 · Jul 18, 2026

Open the Tavaborole interaction page

How much people look this up

Where Water Germander and Tavaborole 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 Water Germander
Steady interest

#1,319 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Tavaborole
Top 25%

#593 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. Water Germander 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 Water Germander reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Water Germander and Tavaborole records this page draws on were last updated June 20, 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 Water Germander

What is Water Germander?

  • Digestive upset
  • Weight loss aids
  • Fever
  • Oral hygiene and mouthwash
  • Gout

Water germander (often sold as the related plant wall germander, Teucrium chamaedrys) is a Mediterranean herb traditionally used for digestion and other ailments. Its oral use has been clearly linked to serious liver damage, including hepatitis and even death, so it is considered likely unsafe to take by mouth. We recommend avoiding it and talking to your pharmacist or doctor about safer options.

Teucrium chamaedrys · Lamiaceae · Aerial parts (leaves, flowering tops) · Tea, capsules, tinctures, liquid extracts

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

Water Germander: dosing

Always read product labels carefully, since germander is sometimes hidden in herbal blends or weight-loss products.

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

Read the full Water Germander monograph & all interactions
Medication

About Tavaborole Topical

What Is Tavaborole Topical Used For?

Brand name: Kerydin

Tavaborole topical solution is used to treat onychomycosis of the toenails — a fungal infection of the toenails caused by Trichophyton rubrum or Trichophyton mentagrophytes, the two most common nail fungi.

It is applied directly to the toenail and is approved for adults and children 6 years of age and older.

Most-Reported Side Effects for Tavaborole

From FAERS, the FDA’s public side-effect reporting system (65 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Injection site pain 4 reports
Product dose omission in error 4 reports
Cough 3 reports
Product packaging quantity issue 3 reports
Pruritus 3 reports
See full Tavaborole Topical drug information
Keep checking

Other Drugs & Water Germander

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

See the full Water Germander interactions page
See every supplement checked against Tavaborole, ranked by severity
Evidence & sources

Water Germander References

The 2 sources that drive our Water Germander monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Water Germander is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. LiverTox: Germander — NIH / NCBI Bookshelf Source
  2. Herbs at a Glance — 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 Water Germander and Tavaborole Together: Common Questions

Is it safe to take Water Germander with Tavaborole?
We do not list a known interaction between Water Germander and Tavaborole. 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 Tavaborole interact with any supplements?
Yes. Tavaborole has documented interactions with 3 supplements in our database — Water Germander is not one of them. The Tavaborole 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

Water Germander monograph Uses, safety profile, and every drug interaction in one place Tavaborole Topical drug information The full plain-English guide to this medication Tavaborole supplement interactions Every supplement checked against Tavaborole, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Tavaborole and Water Germander?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.