Drug & supplement interaction

Water Hemlock + Carvedilol

Carvedilol brand names: Coreg, Coreg CR.

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

We found no known interaction between Water Hemlock and Carvedilol 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. Additionally, although there is no interaction, the label for Carvedilol states a food rule worth keeping to, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Water Hemlock and Carvedilol

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 Carvedilol and Water Hemlock 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.

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 Hemlock safety at a glance

Water Hemlock overall Avoid Water hemlock is deadly poisonous and should never be consumed.
Pregnancy Unsafe When used orally or topically. Water hemlock is toxic; avoid using. Read the full pregnancy detail
Breastfeeding Unsafe When used orally or topically. Water hemlock is toxic; 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 Carvedilol and Water Hemlock? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Carvedilol

Interactions in our licensed database are recorded against drug classes, not just single drug names. Carvedilol is filed under 7 classifications — including beta-blockers, cytochrome p450 2c9 (cyp2c9) substrates, antihypertensive drugs. Water Hemlock has documented interactions with 1 drug class — the most serious being lithium (moderate) — and none of Carvedilol’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Water Hemlock Does Interact With Other Medications

Water Hemlock has 1 moderate known drug interaction in our database — Carvedilol isn’t one of them. If you take anything else, check it against the full list below.

Moderate 1 No known interaction 2,829 (incl. Carvedilol)
Taking anything else?

Check Another of Your Medications Against Water Hemlock

Covers the 2,830 medications we’ve checked against Water Hemlock. Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Water Hemlock and Carvedilol May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. One of them is worth acting on rather than waiting out — marked below.

  • Seizures Worth acting on Additional detail

    Water Hemlock

    “Water hemlock is a known highly toxic plant and causes a variety of symptoms including vomiting, acute renal failure, marked metabolic acidosis, seizures and convulsions, or unconsciousness that may lead to death.”

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

    6 sources cited
    1. 6350. Applefeld JJ, Caplan ES. A case of water hemlock poisoning. JACEP 1979;8:401-3. PubMed
    2. 54716. Rizzi, D., Basile, C., Di Maggio, A., Sebastio, A., Introna, F., Jr., Rizzi, R., Scatizzi, A., De Marco, S., and Smialek, J. E. Clinical spectrum of accidental hemlock poisoning: neurotoxic manifestations, rhabdomyolysis and acute tubular necrosis. Nephr PubMed
    3. 6351. Carlton BE, Tufts E, Girard DE. Water hemlock poisoning complicated by rhabdomyolysis and renal failure. Clin Toxicol 1979;14:87-92. PubMed
    4. 6348. Knutsen OH, Paszkowski P. New aspects in the treatment of water hemlock poisoning. J Toxicol Clin Toxicol 1984;22:157-66. PubMed
    5. 6346. Starreveld E, Hope E. Cicutoxin poisoning (water hemlock). Neurol 1975;25:730-4. PubMed
    6. 85535. Landers, D., Seppi, K., and Blauer, W. Seizures and death on a white river float trip. Report of water hemlock poisoning. West J.Med. 1985;142(5):637-640. DOI

    “According to case reports, oral ingestion may cause an explosive illness with seizures and convulsions, neurologic lethargy, or unconsciousness that may lead to death.”

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

    6 sources cited
    1. 54716. Rizzi, D., Basile, C., Di Maggio, A., Sebastio, A., Introna, F., Jr., Rizzi, R., Scatizzi, A., De Marco, S., and Smialek, J. E. Clinical spectrum of accidental hemlock poisoning: neurotoxic manifestations, rhabdomyolysis and acute tubular necrosis. Nephr PubMed
    2. 85535. Landers, D., Seppi, K., and Blauer, W. Seizures and death on a white river float trip. Report of water hemlock poisoning. West J.Med. 1985;142(5):637-640. DOI
    3. 6348. Knutsen OH, Paszkowski P. New aspects in the treatment of water hemlock poisoning. J Toxicol Clin Toxicol 1984;22:157-66. PubMed
    4. 6346. Starreveld E, Hope E. Cicutoxin poisoning (water hemlock). Neurol 1975;25:730-4. PubMed
    5. 6350. Applefeld JJ, Caplan ES. A case of water hemlock poisoning. JACEP 1979;8:401-3. PubMed
    6. 85531. Heath, K. B. A fatal case of apparent water hemlock poisoning. Vet.Hum.Toxicol. 2001;43(1):35-36.

    Carvedilol

    Listed in the ADVERSE REACTIONS section of the FDA label for Carvedilol. Read the label on DailyMed ›

  • A fast or pounding heartbeat / Low blood pressure Additional detail

    Water Hemlock

    “According to case reports, oral ingestion may cause an explosive illness with orthostatic hypotension or tachycardia.”

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

    1 source cited
    1. 6350. Applefeld JJ, Caplan ES. A case of water hemlock poisoning. JACEP 1979;8:401-3. PubMed

    Carvedilol

    Listed in the ADVERSE REACTIONS section of the FDA label for Carvedilol. Read the label on DailyMed ›

  • Tiredness Additional detail

    Water Hemlock

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

    Carvedilol

    Listed in the ADVERSE REACTIONS section of the FDA label for Carvedilol. Read the label on DailyMed ›

  • Vomiting Additional detail

    Water Hemlock

    “According to case reports, oral ingestion causes an explosive illness with nausea, vomiting, or abdominal cramps.”

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

    1 source cited
    1. 6350. Applefeld JJ, Caplan ES. A case of water hemlock poisoning. JACEP 1979;8:401-3. PubMed

    Carvedilol

    Listed in the ADVERSE REACTIONS section of the FDA label for Carvedilol. Read the label on DailyMed ›

  • Nausea Additional detail

    Water Hemlock

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

    Carvedilol

    Listed in the ADVERSE REACTIONS section of the FDA label for Carvedilol. Read the label on DailyMed ›

Reported for Water Hemlock but not commonly for Carvedilol: stomach pain, severe muscle breakdown and kidney problems.

Effects for Carvedilol come from the ADVERSE REACTIONS section of its FDA label; effects for Water Hemlock come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Water Hemlock in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally or topically. Water hemlock is toxic; 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

How to take them

Some Carvedilol Products Have a Food Rule — Water Hemlock Should Not Break It

At least one FDA label for a product containing Carvedilol says to take it with food. If you take Water Hemlock on an empty stomach out of habit, keep them separate — and take Carvedilol with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Carvedilol products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

2 DOSAGE AND ADMINISTRATION COREG should be taken with food to slow the rate of absorption and reduce the incidence of orthostatic effects.

From the Dosage and Administration section of the FDA label we read for Carvedilol — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

From our Q&A

Questions About Water Hemlock or Carvedilol

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

This page covers Water Hemlock only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Carvedilol page lists 211 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Grapefruit (major) and Indian Snakeroot (major).

By severity: 6 major · 171 moderate · 34 minor.

From our pharmacist’s overview on the Carvedilol page

“People take carvedilol (Coreg) for heart failure and high blood pressure, conditions where a sudden swing in pressure or heart rate matters, and its supplement list runs to 211 ingredients, so this one calls for genuine care. More than half of those entries lower blood pressure on their own, fish oil and celery seed among them, and can…”

Reviewed by 2 · Jul 18, 2026

Open the Carvedilol interaction page

How much people look this up

Where Water Hemlock and Carvedilol 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 Hemlock
Top half

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

29 days ago today
Medication Carvedilol
Top 10%

#213 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 Water Hemlock reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Water Hemlock and Carvedilol 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 Water Hemlock

What is Water Hemlock?

  • Historically misused in folk practice (not recommended)
  • Sometimes confused with edible wild carrots or parsnips
  • No safe medicinal use

Water hemlock is one of the most poisonous plants in North America and is NOT a safe dietary supplement or herbal remedy. Even small amounts can cause violent seizures and death. Never eat, brew, or take any part of this plant, and seek emergency care immediately if exposure is suspected.

Cicuta maculata · Apiaceae · None — this is a toxic plant, not a usable supplement (roots are the most poisonous part) · Not used as a supplement; sometimes mistaken for edible wild plants

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

Water Hemlock: dosing

There is no safe dose of water hemlock. The only appropriate action with this plant is avoidance and, in case of exposure, emergency care.

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

Read the full Water Hemlock monograph & all interactions
Medication

About Carvedilol

What Is Carvedilol Used For?

Brand names: Coreg, Coreg CR

Carvedilol is used to treat three main conditions: mild-to-severe chronic heart failure, high blood pressure (hypertension), and reduced heart pumping function (left ventricular dysfunction) in people who have survived a heart attack. For heart failure, it is usually prescribed alongside other medications such as diuretics, ACE inhibitors, and digitalis to help people live longer and reduce the chance of hospital stays.

For people who have had a heart attack and whose heart is not pumping as well as it should, carvedilol is used to lower the risk of dying from heart-related causes. For high blood pressure, it can be used on its own or combined with other blood pressure medicines.

Most-Reported Side Effects for Carvedilol

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.

Fatigue 9,141 reports
Dyspnea 8,542 reports
Diarrhea 7,250 reports
Dizziness 7,211 reports
Nausea 6,830 reports
See full Carvedilol drug information
Keep checking

Other Drugs & Water Hemlock

Browse every other medication we’ve checked against Water Hemlock — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
1Moderate
0Minor
2,828No known interaction
1 Moderate 2,828 No interaction
Moderate

1 interaction

No interaction 2,828 drugs checked — show the list

We also checked Water Hemlock against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,828 medications checked with no known interaction — see the full Water Hemlock list.

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

Water Hemlock References

The 8 references that drive our Water Hemlock 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. Starreveld E, Hope E. Cicutoxin poisoning (water hemlock). Neurol 1975;25:730-4. PubMed
  2. Knutsen OH, Paszkowski P. New aspects in the treatment of water hemlock poisoning. J Toxicol Clin Toxicol 1984;22:157-66. PubMed
  3. Anon. Water hemlock poisoning - Maine, 1992. MMWR Morb Mortal Wkly Rep 1994;43:229-31. Available at: http://www.cdc.gov/mmwr/preview/mmwrhtml/00026056.htm.
  4. Applefeld JJ, Caplan ES. A case of water hemlock poisoning. JACEP 1979;8:401-3. PubMed
  5. Carlton BE, Tufts E, Girard DE. Water hemlock poisoning complicated by rhabdomyolysis and renal failure. Clin Toxicol 1979;14:87-92. PubMed
  6. Rizzi, D., Basile, C., Di Maggio, A., Sebastio, A., Introna, F., Jr., Rizzi, R., Scatizzi, A., De Marco, S., and Smialek, J. E. Clinical spectrum of accidental hemlock poisoning: neurotoxic manifestations, rhabdomyolysis and acute tubular necrosis. Nephr PubMed
  7. Heath, K. B. A fatal case of apparent water hemlock poisoning. Vet.Hum.Toxicol. 2001;43(1):35-36.
  8. Landers, D., Seppi, K., and Blauer, W. Seizures and death on a white river float trip. Report of water hemlock poisoning. West J.Med. 1985;142(5):637-640. DOI

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 Hemlock and Carvedilol Together: Common Questions

Is it safe to take Water Hemlock with Carvedilol?
We do not list a known interaction between Water Hemlock and Carvedilol. 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.
Do Water Hemlock and Carvedilol have any of the same side effects?
Yes — our sources link each of them separately to 6 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Should I take Water Hemlock and Carvedilol at the same time of day?
At least one FDA label for a product containing Carvedilol says to take it with food. If you take Water Hemlock on an empty stomach out of habit, keep them separate and take Carvedilol with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Carvedilol products can differ — so check the directions on your own box. This is about absorption, not an interaction.
How was the Water Hemlock and Carvedilol combination checked?
Interactions in our licensed database are recorded against drug classes. Carvedilol is filed under 7 classifications, and Water Hemlock has documented interactions with 1 drug class — none of Carvedilol's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Water Hemlock interact with any other medications?
Yes. Water Hemlock has 1 documented drug interaction in our database — Carvedilol is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Carvedilol interact with any supplements?
Yes. Carvedilol has documented interactions with 211 supplements in our database — Water Hemlock is not one of them. The Carvedilol 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 Hemlock monograph Uses, safety profile, and every drug interaction in one place Carvedilol drug information The full plain-English guide to this medication Carvedilol supplement interactions Every supplement checked against Carvedilol, 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 8 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Carvedilol and Water Hemlock?

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.