Drug & supplement interaction

Krebiozen + Flecainide

Flecainide brand name: Tambocor.

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

We found no known interaction between Krebiozen and Flecainide 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

Krebiozen and Flecainide

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 Flecainide and Krebiozen 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 Krebiozen at all — not against Flecainide, 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.

Krebiozen safety at a glance

Krebiozen overall Avoid Krebiozen was discredited as an ineffective and potentially fraudulent product and is not legally available.
Pregnancy Avoid Avoid entirely; it has no proven safety or benefit for anyone, including during pregnancy.
Breastfeeding Avoid Avoid entirely; it has no proven safety or benefit while breastfeeding.

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

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

What Flecainide’s Own FDA Label Lists

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

  • Memory problems Worth acting on
  • Trouble passing urine Worth acting on
  • Unsteadiness Worth acting on
  • A slow heartbeat Worth acting on
  • A heart attack Worth acting on
  • Yellowing of the skin or eyes Worth acting on
  • Fainting Worth acting on
  • Wheezing Worth acting on
  • An irregular heartbeat Worth acting on
  • Confusion Worth acting on

Showing the 10 most notable of 53 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 Flecainide. Read the label on DailyMed › Krebiozen’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Krebiozen side to compare — that is a limit of the record, not a statement that Krebiozen has no side effects.

From our Q&A

Questions About Krebiozen or Flecainide

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

This page covers Krebiozen only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Flecainide page lists 86 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Cesium (major) and Ephedra (major).

By severity: 7 major · 61 moderate · 18 minor.

From our pharmacist’s overview on the Flecainide page

“Flecainide (Tambocor) exists to control serious heart rhythm problems, so anything that disturbs the rhythm it protects deserves genuine caution. Six of the seven major-rated entries among the 86 supplements and herbs on file, grapefruit in large amounts included, can prolong the QT interval, the heart's electrical reset time, adding t…”

Reviewed by 2 · Jul 18, 2026

Open the Flecainide interaction page

How much people look this up

Where Krebiozen and Flecainide 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 Krebiozen
Steady interest

#1,332 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Flecainide
Top 25%

#483 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.
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Krebiozen and Flecainide records this page draws on were last updated June 22, 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 Krebiozen

What is Krebiozen?

  • Promoted as a cancer treatment (unproven)

Krebiozen was a so-called "cancer cure" promoted in the 1950s and 1960s that was never proven to work and was discredited by U.S. government investigations. It is not a dietary supplement or herb, it is not available legally, and you should not seek it out as a treatment for any condition.

Originally claimed to be derived from horse blood serum (not a plant) · Historically sold as an injectable liquid

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

Krebiozen: dosing

There is no legitimate, established dose for Krebiozen because it is not an approved or recommended treatment. It is not a product you should obtain or use.If you come across something being sold today under the name Krebiozen or marketed as a similar "secret" cancer cure, do not use it.

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

Read the full Krebiozen monograph & all interactions
Medication

About Flecainide

What Is Flecainide Used For?

Brand name: Tambocor

Flecainide Acetate tablets are used to prevent episodes of certain abnormal heart rhythms. In patients without structural heart disease, it is approved to prevent paroxysmal supraventricular tachycardia (PSVT — episodes of rapid heart rate starting above the ventricles) and paroxysmal atrial fibrillation/flutter (PAF — intermittent episodes of irregular, rapid heart rhythm in the upper chambers), when these cause disabling symptoms.

Flecainide Acetate tablets are also used to prevent life-threatening ventricular arrhythmias — dangerous rapid rhythms starting in the lower chambers of the heart, such as sustained ventricular tachycardia. It is not recommended for less serious ventricular arrhythmias, for patients with a recent heart attack, or for chronic (ongoing, persistent) atrial fibrillation.

See full Flecainide drug information
Keep checking

Other Drugs & Krebiozen

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

See the full Krebiozen interactions page
See every supplement checked against Flecainide, ranked by severity
Sources

Sources & How We Checked

We checked Krebiozen against Flecainide in the Natural Medicines interaction database and found no documented interaction on file. The medication overview comes from MedlinePlus, and supplement label details from the NIH Dietary Supplement Label Database.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Krebiozen monograph › Uses, safety, and every drug interaction in one place Flecainide supplement interactions › Every supplement checked against Flecainide, ranked by severity Flecainide drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Krebiozen and Flecainide Together: Common Questions

Is it safe to take Krebiozen with Flecainide?
We do not list a known interaction between Krebiozen and Flecainide. 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 Flecainide interact with any supplements?
Yes. Flecainide has documented interactions with 86 supplements in our database — Krebiozen is not one of them. The Flecainide 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 Flecainide and Krebiozen?

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.