Drug & supplement interaction

Hemlock Water Dropwort + Mometasone

Mometasone brand names: Elocon, Asmanex.

No Known Interaction
The bottom line No known interaction

We found no known interaction between Hemlock Water Dropwort and Mometasone 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

Hemlock Water Dropwort and Mometasone

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 Mometasone and Hemlock Water Dropwort 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 Hemlock Water Dropwort at all — not against Mometasone, 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.

Hemlock Water Dropwort safety at a glance

Hemlock Water Drop... overall Avoid This plant is highly poisonous and can be fatal if eaten.
Pregnancy Unsafe When used orally. Ingestion can be lethal. Read the full pregnancy detail
Breastfeeding Unsafe When used orally. Ingestion can be lethal. 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 Mometasone and Hemlock Water Dropwort? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Hemlock Water Dropwort Itself Has Been Linked To

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

  • Confusion Worth acting on Additional detail

    “Orally, hemlock water dropwort root can cause nausea, dizziness,, abdominal pain, vomiting, sweating, salivation, weakness, confusion, slurred speech, muscle spasms, tonic-clonic movements, glycosuria, hematuria, hyperventilation, cyanosis, exhaustion, seizures, metabolic acidosis, generalized convulsions, unconsciousness, dilated pupils, cardiac arrest , respiratory depression, and death.”

    Hemlock Water Dropwort · Natural Medicines adverse-effect record, reported in cardiac arrest.

    4 sources cited
    1. 6334. Mitchell MI, Routledge PA. Hemlock water dropwort poisoning-a review. Clin Toxicol 1978;12:417-26. PubMed
    2. 6335. Ball MJ, Flather ML, Forfar JC. Hemlock water dropwort poisoning. Postgrad Med J 1987;63:363-5. PubMed
    3. 6332. Fitzgerald P, Moss N, O'Mahony S, Whelton MJ. Accidental hemlock poisoning. Br Med J (Clin Res Ed) 1987;295:1657. PubMed
    4. 103905. Henry FJ, Cadiet J, Javaudin F, Rozec B. Oenantha Crocata: A Case Report of Multiple Poisoning with Fatal Outcome. J Emerg Med. 2020;59(1):e9-e11. PubMed

    “Orally, hemlock water dropwort root can cause dizziness, confusion, slurred speech, exhaustion, unconsciousness, tonic-clonic movements, seizures, and generalized convulsions.”

    Hemlock Water Dropwort · Natural Medicines adverse-effect record, reported in epilepsy.

    3 sources cited
    1. 6334. Mitchell MI, Routledge PA. Hemlock water dropwort poisoning-a review. Clin Toxicol 1978;12:417-26. PubMed
    2. 6332. Fitzgerald P, Moss N, O'Mahony S, Whelton MJ. Accidental hemlock poisoning. Br Med J (Clin Res Ed) 1987;295:1657. PubMed
    3. 6335. Ball MJ, Flather ML, Forfar JC. Hemlock water dropwort poisoning. Postgrad Med J 1987;63:363-5. PubMed
  • Seizures Worth acting on Additional detail

    “Orally, hemlock water dropwort root can cause cardiac arrest. In a case report, a 63-year-old male suffered cardiac arrest, grand mal seizure, and severe metabolic acidosis after mistakenly eating hemlock water dropwort roots that he thought were radishes. Supportive care was insufficient and the patient died within a day. There is no known antidote for hemlock water dropwort poisoning.”

    Hemlock Water Dropwort · Natural Medicines adverse-effect record, reported in cardiac arrest.

    1 source cited
    1. 103905. Henry FJ, Cadiet J, Javaudin F, Rozec B. Oenantha Crocata: A Case Report of Multiple Poisoning with Fatal Outcome. J Emerg Med. 2020;59(1):e9-e11. PubMed
  • Sweating Additional detail

    Recorded for Hemlock Water Dropwort in the same Natural Medicines adverse-effect record shown under Confusion above.

  • Muscle pain Additional detail

    “Orally, hemlock water dropwort root can cause weakness, paralysis, muscle spasms, tonic-clonic movements, seizures, and generalized convulsions.”

    Hemlock Water Dropwort · Natural Medicines adverse-effect record, reported in epilepsy.

    4 sources cited
    1. 6332. Fitzgerald P, Moss N, O'Mahony S, Whelton MJ. Accidental hemlock poisoning. Br Med J (Clin Res Ed) 1987;295:1657. PubMed
    2. 6334. Mitchell MI, Routledge PA. Hemlock water dropwort poisoning-a review. Clin Toxicol 1978;12:417-26. PubMed
    3. 6335. Ball MJ, Flather ML, Forfar JC. Hemlock water dropwort poisoning. Postgrad Med J 1987;63:363-5. PubMed
    4. 103905. Henry FJ, Cadiet J, Javaudin F, Rozec B. Oenantha Crocata: A Case Report of Multiple Poisoning with Fatal Outcome. J Emerg Med. 2020;59(1):e9-e11. PubMed
  • Stomach pain / Vomiting / Nausea Additional detail

    “Orally, hemlock water dropwort root can cause nausea, salivation, abdominal pain, and vomiting.”

    Hemlock Water Dropwort · Natural Medicines adverse-effect record, reported in nausea and vomiting.

    4 sources cited
    1. 6334. Mitchell MI, Routledge PA. Hemlock water dropwort poisoning-a review. Clin Toxicol 1978;12:417-26. PubMed
    2. 6335. Ball MJ, Flather ML, Forfar JC. Hemlock water dropwort poisoning. Postgrad Med J 1987;63:363-5. PubMed
    3. 6332. Fitzgerald P, Moss N, O'Mahony S, Whelton MJ. Accidental hemlock poisoning. Br Med J (Clin Res Ed) 1987;295:1657. PubMed
    4. 103905. Henry FJ, Cadiet J, Javaudin F, Rozec B. Oenantha Crocata: A Case Report of Multiple Poisoning with Fatal Outcome. J Emerg Med. 2020;59(1):e9-e11. PubMed
  • Dizziness Additional detail

    Recorded for Hemlock Water Dropwort in the same Natural Medicines adverse-effect record shown under Confusion above.

Everything above comes from the Natural Medicines adverse-effect record for Hemlock Water Dropwort — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Mometasone’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Mometasone column appears here.

Special populations

Hemlock Water Dropwort in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally. Ingestion can be lethal.

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 Mometasone

This page covers Hemlock Water Dropwort only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Mometasone page lists 141 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Adrafinil (moderate).

By severity: 3 major · 96 moderate · 42 minor.

Open the Mometasone interaction page

One more smart check

Taking Hemlock Water Dropwort as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1 real supplement products containing Hemlock Water Dropwort, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Hemlock Water Dropwort. Even though Hemlock Water Dropwort itself has no known interaction with Mometasone, 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 Hemlock Water Dropwort and Mometasone 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 Hemlock Water Dropwort
Steady interest

#1,026 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Mometasone
Top 25%

#369 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 Hemlock Water Dropwort reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Hemlock Water Dropwort and Mometasone 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 Hemlock Water Dropwort

What is Hemlock Water Dropwort?

  • Historical/folk wound poultices (unsafe)
  • Traditional topical use (unsafe)
  • Subject of toxicology research

Hemlock water dropwort is one of the most poisonous plants in Europe and is NOT a safe dietary supplement or herbal remedy. Every part of the plant is toxic, and even small amounts can cause seizures, heart problems, and death. Do not consume it in any form.

Oenanthe crocata · Apiaceae · Whole plant, especially the roots (highly toxic) · Not used as a supplement; the plant is a poisonous wild herb

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

Hemlock Water Dropwort: dosing

There is no safe dose of hemlock water dropwort. The only correct "dose" is none at all.

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

Read the full Hemlock Water Dropwort monograph & all interactions
Medication

About Mometasone Topical

What Is Mometasone Topical Used For?

Brand names: Elocon, Asmanex

Mometasone Furoate topical products are used to relieve the inflammation and itching (pruritus) that come with corticosteroid-responsive dermatoses — a broad category of skin conditions that respond to steroid treatment.

Mometasone Furoate Topical Solution (Lotion) is specifically indicated for these skin conditions in patients 12 years of age and older. Mometasone Furoate cream may be used in adults and in children 2 years of age and older.

See full Mometasone Topical drug information
Keep checking

Other Drugs & Hemlock Water Dropwort

Browse every other medication we’ve checked against Hemlock Water Dropwort — 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
No interaction 2,829 drugs checked — show the list
Evidence & sources

Hemlock Water Dropwort References

The 4 references that drive our Hemlock Water Dropwort 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. Fitzgerald P, Moss N, O'Mahony S, Whelton MJ. Accidental hemlock poisoning. Br Med J (Clin Res Ed) 1987;295:1657. PubMed
  2. Mitchell MI, Routledge PA. Hemlock water dropwort poisoning-a review. Clin Toxicol 1978;12:417-26. PubMed
  3. Ball MJ, Flather ML, Forfar JC. Hemlock water dropwort poisoning. Postgrad Med J 1987;63:363-5. PubMed
  4. Henry FJ, Cadiet J, Javaudin F, Rozec B. Oenantha Crocata: A Case Report of Multiple Poisoning with Fatal Outcome. J Emerg Med. 2020;59(1):e9-e11. PubMed

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 Hemlock Water Dropwort and Mometasone Together: Common Questions

Is it safe to take Hemlock Water Dropwort with Mometasone?
We do not list a known interaction between Hemlock Water Dropwort and Mometasone. 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 Mometasone interact with any supplements?
Yes. Mometasone has documented interactions with 141 supplements in our database — Hemlock Water Dropwort is not one of them. The Mometasone interaction page linked on this page lists every one, ranked by severity.

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

Still Have a Question About Mometasone and Hemlock Water Dropwort?

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.