Drug & supplement interaction

Male Fern + Cyclacillin

Cyclacillin brand names: Cyclapen-W, Cylcapen.

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 Male Fern and Cyclacillin 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

Male Fern and Cyclacillin

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 Cyclacillin and Male 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 Male Fern at all — not against Cyclacillin, 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.

Male Fern safety at a glance

Male Fern overall Avoid Male fern is potentially toxic and has a very narrow margin between an effective and a poisonous dose.
Pregnancy Likely Unsafe When used orally; contraindicated. There is insufficient reliable information available about the safety of male fern used topically; avoid using. Read the full pregnancy detail
Breastfeeding Likely Unsafe When used orally; contraindicated. There is insufficient reliable information available about the safety of male fern used topically; avoid using. 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 Cyclacillin and Male Fern? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Male Fern Itself Has Been Linked To

This is not an interaction — nothing below involves Cyclacillin. It is the side-effect record for Male Fern on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Male Fern, this list is the first place to look. 2 entries are worth acting on rather than waiting out — marked below.

  • Loss of vision / Shortness of breath Worth acting on Additional detail

    “When used orally, male fern may be unsafe.

    Most Common Adverse Effects:

    Orally: Diarrhea, dyspnea, headaches, nausea, optic neuritis, tremors, and vertigo.

    Serious Adverse Effects (Rare):

    Orally: Symptoms of toxicity include cardiac and respiratory failure, coma, muscular weakness, seizures, and temporary or permanent blindness. Death has occurred with severe poisoning.”

    Male Fern · Natural Medicines adverse-effect record, reported in diarrhea.

  • Muscle weakness / Seizures Worth acting on Additional detail

    “Orally, male fern can cause coma, headaches, muscle weakness, seizures, tremors, and vertigo (6,11).”

    Male Fern · Natural Medicines adverse-effect record, reported in epilepsy.

    2 sources cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    2. 11. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  • Dizziness / Headache Additional detail

    Recorded for Male Fern in the same Natural Medicines adverse-effect record shown under Loss of vision / Shortness of breath above.

  • Diarrhea / Nausea Additional detail

    “Orally, male fern can cause nausea and diarrhea (6).”

    Male Fern · Natural Medicines adverse-effect record, reported in diarrhea.

    1 source cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.

Everything above comes from the Natural Medicines adverse-effect record for Male Fern — expand a row for the licensed statement it rests on. We haven’t matched Cyclacillin to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Cyclacillin.

Special populations

Male Fern in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Unsafe

When used orally; contraindicated. There is insufficient reliable information available about the safety of male fern used topically; avoid using.

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

Everything else you take

See Every Supplement That Interacts With Cyclacillin

This page covers Male Fern only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Cyclacillin page lists 44 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Bacillus Coagulans (moderate), Bacillus Subtilis (moderate), Bifidobacterium Animalis Subsp. Lactis (moderate) and Bifidobacterium Bifidum (moderate).

By severity: 1 major · 33 moderate · 10 minor.

From our pharmacist’s overview on the Cyclacillin page

“The pairing I would flag first for anyone on cyclacillin (Cyclapen-W) is activated charcoal, the sole major-rated entry among the 44 supplements and herbs on file. Charcoal binds drugs in the gut, so it can pull down how much of this penicillin-class antibiotic reaches your blood, and an underdosed antibiotic may leave the infection un…”

Reviewed by 2 · Jul 18, 2026

Open the Cyclacillin interaction page

One more smart check

Taking Male Fern as Part of a Dietary Supplement Product? Check It for Interactions

We hold 35 real supplement products containing Male Fern, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Male Fern. Even though Male Fern itself has no known interaction with Cyclacillin, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Male Fern and Cyclacillin 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 Male Fern
Steady interest

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

29 days ago today
Medication Cyclacillin
Top 25%

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

What is Male Fern?

  • Intestinal worms (especially tapeworm)
  • Traditional deworming remedy
  • Folk wound care

Male fern is an old herbal remedy that was once used as a powerful treatment to expel tapeworms. It is now considered outdated and potentially dangerous because of its narrow safety margin and risk of serious poisoning, and safer modern medicines have replaced it. It should not be used for self-treatment.

Dryopteris filix-mas · Dryopteridaceae · Rhizome (underground stem) and root · Liquid extract (oleoresin), capsules, and historically a crude root powder

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

Male Fern: dosing

There is no safe, established self-care dose for male fern, and it is not recommended for home use. In the past it was given by medical professionals in carefully measured amounts under supervision, precisely because the line between an effective and a toxic dose is so thin.If you ever encounter a product containing male fern, do not guess at a dose.

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

Read the full Male Fern monograph & all interactions
Keep checking

Other Drugs & Male Fern

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

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

Male Fern References

The 3 references that drive our Male Fern 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. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  3. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.

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 Male Fern and Cyclacillin Together: Common Questions

Is it safe to take Male Fern with Cyclacillin?
We do not list a known interaction between Male Fern and Cyclacillin. 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 Cyclacillin interact with any supplements?
Yes. Cyclacillin has documented interactions with 44 supplements in our database — Male Fern is not one of them. The Cyclacillin 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

Male Fern monograph Uses, safety profile, and every drug interaction in one place Cyclacillin supplement interactions Every supplement checked against Cyclacillin, 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 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Cyclacillin and Male Fern?

Our pharmacists answer your medication & supplement questions — free.

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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.