Drug & supplement interaction

Masterwort + Vincristine Sulfate

Vincristine Sulfate brand name: Marqibo Kit.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Masterwort and Vincristine Sulfate 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

Masterwort and Vincristine Sulfate

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 Vincristine Sulfate and Masterwort 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.

Masterwort safety at a glance

Masterwort overall Use caution Limited safety data exist, and the plant can cause sun-triggered skin reactions.
Pregnancy Avoid Not enough safety information; best avoided during pregnancy.
Breastfeeding Avoid No reliable safety data, so avoid while breastfeeding.

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

Still wondering about combining Vincristine Sulfate and Masterwort? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Vincristine Sulfate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Vincristine Sulfate is filed under 3 classifications — p-glycoprotein substrates, seizure threshold lowering drugs, cytochrome p450 3a4 (cyp3a4) substrates. Masterwort has documented interactions with 1 drug class — the most serious being photosensitizing drugs (moderate) — and none of Vincristine Sulfate’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

Masterwort Does Interact With Other Medications

Masterwort has 335 moderate known drug interactions in our database — Vincristine Sulfate isn’t one of them. If you take anything else, check it against the full list below.

Moderate 335 No known interaction 2,495 (incl. Vincristine Sulfate)
Taking anything else?

Check Another of Your Medications Against Masterwort

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

What to actually watch for

What Vincristine Sulfate’s Own FDA Label Lists

This is not an interaction — none of it involves Masterwort. These are the most notable effects listed in the ADVERSE REACTIONS section of Vincristine Sulfate’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.

  • Loss of vision Worth acting on
  • Hearing loss Worth acting on
  • A bowel blockage Worth acting on
  • Pain or burning when passing urine Worth acting on
  • Dehydration Worth acting on
  • Trouble passing urine Worth acting on
  • Low sodium Worth acting on
  • Unsteadiness Worth acting on
  • A heart attack Worth acting on
  • Seizures Worth acting on

Showing the 10 most notable of 35 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 Vincristine Sulfate. Read the label on DailyMed › Masterwort’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Masterwort side to compare — that is a limit of the record, not a statement that Masterwort has no side effects.

Everything else you take

See Every Supplement That Interacts With Vincristine Sulfate

This page covers Masterwort only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Vincristine Sulfate page lists 131 supplements it has a documented interaction with, worst first, each one explained.

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

By severity: 2 major · 101 moderate · 28 minor.

From our pharmacist’s overview on the Vincristine Sulfate page

“Chemotherapy leaves little room for error, and vincristine sulfate (Marqibo) is no exception. Nearly everything on this list changes how the body handles the drug through a pathway called CYP3A4, so a supplement can either push vincristine levels high enough to worsen its nerve toxicity or drop them low enough to blunt the cancer treat…”

Reviewed by 2 · Jul 18, 2026

Open the Vincristine Sulfate interaction page

How much people look this up

Where Masterwort and Vincristine Sulfate 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 Masterwort
Top half

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

29 days ago today
Medication Vincristine Sulfate
Top half

#738 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 Masterwort reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Masterwort and Vincristine Sulfate 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 Masterwort

What is Masterwort?

Masterwort
  • Digestive upset
  • Mild anxiety and tension
  • Skin complaints
  • Respiratory and cough relief
  • Traditional tonic

Masterwort (Heracleum sphondylium), a plant in the carrot family, has a long folk-medicine history for digestion, nerves, and skin. Modern scientific evidence to support these uses is very limited, and the plant can cause skin reactions to sunlight, so use it cautiously and talk with your pharmacist or doctor first.

Heracleum sphondylium · Apiaceae · Root, leaves, seeds, and aerial parts · Tea, tincture, dried herb, essential oil

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

Masterwort: dosing

There is no standardized, well-established dose for masterwort. Traditional preparations vary widely, and product strengths are not consistent.If you choose to use a commercial product, follow the directions on the label and do not exceed the suggested amount.

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

Read the full Masterwort monograph & all interactions
Medication

About Vincristine Sulfate

Most-Reported Side Effects for Vincristine Sulfate

From FAERS, the FDA’s public side-effect reporting system (29,133 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Febrile neutropenia 4,418 reports
Fever 1,922 reports
Neutropenia 1,742 reports
Sepsis 1,101 reports
Vomiting 1,021 reports
Keep checking

Other Drugs & Masterwort

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

0Major
335Moderate
0Minor
2,494No known interaction
335 Moderate 2,494 No interaction
Moderate

335 interactions

Showing 60 of 335 moderate interactions — see all 335 on the Masterwort page.

No interaction 2,494 drugs checked — show the list

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

Showing the 60 most looked-up of 2,494 medications checked with no known interaction — see the full Masterwort list.

See the full Masterwort interactions page
See every supplement checked against Vincristine Sulfate, ranked by severity
Evidence & sources

Masterwort References

The 1 references that drive our Masterwort 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. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.

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 Masterwort and Vincristine Sulfate Together: Common Questions

Is it safe to take Masterwort with Vincristine Sulfate?
We do not list a known interaction between Masterwort and Vincristine Sulfate. 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.
How was the Masterwort and Vincristine Sulfate combination checked?
Interactions in our licensed database are recorded against drug classes. Vincristine Sulfate is filed under 3 classifications, and Masterwort has documented interactions with 1 drug class — none of Vincristine Sulfate'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 Masterwort interact with any other medications?
Yes. Masterwort has 335 documented drug interactions in our database — Vincristine Sulfate 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 Vincristine Sulfate interact with any supplements?
Yes. Vincristine Sulfate has documented interactions with 131 supplements in our database — Masterwort is not one of them. The Vincristine Sulfate 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

Masterwort monograph Uses, safety profile, and every drug interaction in one place Vincristine Sulfate supplement interactions Every supplement checked against Vincristine Sulfate, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Vincristine Sulfate and Masterwort?

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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.