Drug & supplement interaction

Lady Fern + Posaconazole

Posaconazole brand name: Noxafil.

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

We found no known interaction between Lady Fern and Posaconazole 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

Lady Fern and Posaconazole

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 Posaconazole and Lady Fern 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 Lady Fern at all — not against Posaconazole, 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.

Lady Fern safety at a glance

Lady Fern overall Use caution Limited safety data exist; some ferns can be irritating or harmful if eaten raw or in large amounts.
Pregnancy Avoid Not enough safety information; avoid medicinal use during pregnancy.
Breastfeeding Avoid No reliable safety data; best avoided while breastfeeding.

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

Still wondering about combining Posaconazole and Lady Fern? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Posaconazole’s Own FDA Label Lists

This is not an interaction — none of it involves Lady Fern. These are the most notable effects listed in the ADVERSE REACTIONS section of Posaconazole’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. 10 of them are worth acting on rather than waiting out — marked below.

  • An electrolyte imbalance Worth acting on
  • Low magnesium Worth acting on
  • A low white blood cell count Worth acting on mentioned in 11.2% of FDA reports for Posaconazole
  • Low potassium Worth acting on
  • Blood clots Worth acting on
  • High blood sugar Worth acting on
  • An irregular heartbeat Worth acting on
  • A low platelet count Worth acting on mentioned in 3.3% of FDA reports for Posaconazole
  • Anemia Worth acting on
  • Raised blood pressure Worth acting on

Showing the 10 most notable of 39 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 Posaconazole. Read the label on DailyMed › Where a percentage is shown, it is the share of 15,719 voluntary FDA FAERS reports for Posaconazole that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Lady Fern’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Lady Fern side to compare — that is a limit of the record, not a statement that Lady Fern has no side effects.

From our Q&A

Questions About Lady Fern or Posaconazole

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

This page covers Lady Fern only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Posaconazole page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the Posaconazole page

“All 17 supplements on this posaconazole (Noxafil) list interact the same basic way: they can change how much of the antifungal actually reaches your blood. Posaconazole prevents and treats dangerous fungal infections, often in people with weakened immune systems, so this is a list to take genuine care with.”

Reviewed by 2 · Jul 18, 2026

Open the Posaconazole interaction page

How much people look this up

Where Lady Fern and Posaconazole 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 Lady Fern
Steady interest

#1,368 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Posaconazole
Top 25%

#671 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. Lady Fern 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 Lady Fern reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Lady Fern and Posaconazole 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 Lady Fern

What is Lady Fern?

  • Traditional digestive complaints
  • Folk remedy for intestinal worms
  • Topical use for wounds and skin irritation
  • General traditional tonic
  • Eaten as a foraged spring vegetable (fiddleheads)

Lady fern is a woodland fern used in some folk traditions and occasionally foraged for its young fronds (fiddleheads). There is very little scientific evidence to support any medicinal use, and some ferns can be unsafe if raw or improperly prepared, so caution is warranted.

Athyrium filix-femina · Athyriaceae · Rhizome (rootstock) and young fronds (fiddleheads) · Dried rhizome, traditional decoction, occasionally cooked young fronds (fiddleheads) as food

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

Lady Fern: dosing

There is no established or standardized medicinal dose for lady fern. It has not been studied enough to recommend a safe and effective amount for any condition.If you choose to use a product that contains lady fern, follow the directions on the label and do not exceed the suggested amount. For fiddleheads used as food, cook them fully according to trusted preparation guidance.

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

Read the full Lady Fern monograph & all interactions
Medication

About Posaconazole

What Is Posaconazole Used For?

Brand name: Noxafil

Posaconazole is used to treat invasive aspergillosis (a serious mold infection that can spread through the body) in adults and certain pediatric patients, depending on the formulation and weight. It is also used to treat oropharyngeal candidiasis (OPC) — a yeast infection of the mouth and throat, including cases that have not responded to itraconazole and/or fluconazole — and this use is specific to the oral suspension in patients aged 13 and older.

Posaconazole is also used for prophylaxis (prevention) of invasive Aspergillus and Candida infections in people at high risk because their immune systems are severely compromised — such as stem cell transplant recipients with graft-versus-host disease (GVHD) or people with blood cancers who have low white blood cell counts from chemotherapy. The specific formulation approved for prevention varies by age and weight.

See full Posaconazole drug information
Keep checking

Other Drugs & Lady Fern

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

See the full Lady Fern interactions page
See every supplement checked against Posaconazole, ranked by severity
Evidence & sources

Lady Fern References

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

  1. Herbs at a Glance — NIH National Center for Complementary and Integrative Health (NCCIH) Source
  2. Herbs and Supplements — MedlinePlus (U.S. National Library of Medicine) 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 Lady Fern and Posaconazole Together: Common Questions

Is it safe to take Lady Fern with Posaconazole?
We do not list a known interaction between Lady Fern and Posaconazole. 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 Posaconazole interact with any supplements?
Yes. Posaconazole has documented interactions with 17 supplements in our database — Lady Fern is not one of them. The Posaconazole 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

Lady Fern monograph Uses, safety profile, and every drug interaction in one place Posaconazole drug information The full plain-English guide to this medication Posaconazole supplement interactions Every supplement checked against Posaconazole, 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 Posaconazole and Lady Fern?

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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.