Drug & supplement interaction

Cesium + Flutamide

Flutamide brand names: Eulexin, Euflex.

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 Cesium and Flutamide 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 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

Cesium and Flutamide

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 Flutamide and Cesium 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.

Cesium safety at a glance

Cesium overall Avoid Cesium chloride can cause life-threatening heart rhythm problems and has no proven benefit.
Pregnancy Avoid Not safe; avoid during pregnancy due to serious toxicity risks.
Breastfeeding Avoid Not safe; avoid while breastfeeding.

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

Still wondering about combining Flutamide and Cesium? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Flutamide

Interactions in our licensed database are recorded against drug classes, not just single drug names. Flutamide is filed under 7 classifications — including cytochrome p450 1a2 (cyp1a2) substrates, cytochrome p450 1a2 (cyp1a2) substrates, photosensitizing drugs. Cesium has documented interactions with 3 drug classes — the most serious being qt interval-prolonging drugs (major), corticosteroids (moderate) and diuretic drugs (moderate) — and none of Flutamide’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

Cesium Does Interact With Other Medications

Cesium has 161 major, 94 moderate known drug interactions in our database — Flutamide isn’t one of them. If you take anything else, check it against the full list below.

Major 161 Moderate 94 No known interaction 2,575 (incl. Flutamide)
Taking anything else?

Check Another of Your Medications Against Cesium

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

What to actually watch for

No Interaction Found — But Data Suggests Cesium and Flutamide 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.

  • Reduced appetite Additional detail

    Cesium

    “Orally, cesium can cause nausea, diarrhea, and anorexia.”

    Cesium · Natural Medicines adverse-effect record, reported in anorexia.

    1 source cited
    1. 7671. Neulieb R. Effect of oral intake of cesium chloride: a single case report. Pharmacol Biochem Behav 1984;21:15-6.

    Flutamide

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

  • Diarrhea / Nausea reported in 4.2% of FDA reports for Flutamide Additional detail

    Cesium

    “Orally and intravenously, cesium can cause life threatening adverse effects.

    Most Common Adverse Effects:

    All ROAs: Diarrhea, nausea, tingling of the lips, hands, and feet.

    Serious Adverse Effects (Rare):

    All ROAs: Arrhythmia, including QT prolongation and torsades de pointes, cardiac arrest, hypokalemia, loss of consciousness, seizures.”

    Cesium · Natural Medicines adverse-effect record, reported in arrhythmia.

    Flutamide

    Listed in the ADVERSE REACTIONS section of the FDA label for Flutamide, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

Reported for Cesium but not commonly for Flutamide: an irregular heartbeat, fainting, a fast or pounding heartbeat and low potassium.

Effects for Flutamide come from the ADVERSE REACTIONS section of its FDA label; effects for Cesium come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 984 voluntary FDA FAERS reports for Flutamide that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Overlapping uses

What Flutamide Is Prescribed For, and What Cesium Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Flutamide is a prescription medicine with approved uses on its FDA label. Cesium is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Flutamide is prescribed for: Eulexin (flutamide) capsules are used to treat prostate cancer in men. They are always used together with an LHRH agonist (a hormone-lowering injection), never alone. Eulexin is indicated for two stages of prostate cancer: locally confined Stage B2-C prostate cancer (used alongside goserelin acetate and radiation therapy, starting eight weeks before radiation begins) and Stage D2 metastatic prostate cancer (cancer that has spread beyond the prostate, taken with an LHRH agonist until the disease progresses).

Cesium has been studied for:

  • Cancer studied, not established Cesium has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Cesium for cancer

    Although there has been interest in using oral cesium for cancer, there is insufficient reliable information about the clinical effects of cesium for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Flutamide on your own; if you are taking Cesium for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Flutamide

This page covers Cesium only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Flutamide page lists 189 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 · 143 moderate · 43 minor.

From our pharmacist’s overview on the Flutamide page

“A man taking flutamide (Eulexin) to block testosterone during prostate cancer treatment cannot afford big swings in the drug's level, and most of the 189 supplements on this page are capable of causing exactly that. The bulk of them work through the liver enzyme CYP3A4, which breaks flutamide down.”

Reviewed by 2 · Jul 18, 2026

Open the Flutamide interaction page

One more smart check

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

We hold 51 real supplement products containing Cesium, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Cesium. Even though Cesium itself has no known interaction with Flutamide, 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 Cesium and Flutamide 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 Cesium
Top half

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

29 days ago today
Medication Flutamide
Steady interest

#1,617 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 Cesium reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Cesium and Flutamide 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 Cesium

What is Cesium?

  • Marketed as an alternative cancer treatment ('high pH therapy')
  • Claimed to alter tumor pH
  • General 'alkaline' health claims

Cesium chloride is a mineral salt sold as an alternative cancer therapy ('high pH therapy'), but there is no reliable scientific evidence that it treats cancer or any other disease. It can cause dangerous heart rhythm problems and even death, so it should not be used. Talk to your doctor or pharmacist before taking any supplement, and never use cesium in place of proven medical care.

Mineral element (cesium chloride salt) · Capsules, powders, liquid solutions (often as cesium chloride)

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

Cesium: dosing

There is no safe or established dose for cesium chloride, and it is not approved as a medicine. Because it can cause life-threatening harm, no dosing recommendation can be given.We strongly advise against taking cesium chloride.

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

Read the full Cesium monograph & all interactions
Medication

About Flutamide

What Is Flutamide Used For?

Brand names: Eulexin, Euflex

Eulexin (flutamide) capsules are used to treat prostate cancer in men. They are always used together with an LHRH agonist (a hormone-lowering injection), never alone.

Eulexin is indicated for two stages of prostate cancer: locally confined Stage B2-C prostate cancer (used alongside goserelin acetate and radiation therapy, starting eight weeks before radiation begins) and Stage D2 metastatic prostate cancer (cancer that has spread beyond the prostate, taken with an LHRH agonist until the disease progresses).

Most-Reported Side Effects for Flutamide

From FAERS, the FDA’s public side-effect reporting system (984 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Prostate cancer 70 reports
Anemia 65 reports
Fatigue 63 reports
Prostatic specific antigen increased 60 reports
Asthenia 46 reports
See full Flutamide drug information
Keep checking

Other Drugs & Cesium

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

161Major
94Moderate
0Minor
2,574No known interaction
161 Major 94 Moderate 2,574 No interaction
Major

161 interactions

Showing 60 of 161 major interactions — see all 161 on the Cesium page.

Moderate

94 interactions

Showing 60 of 94 moderate interactions — see all 94 on the Cesium page.

No interaction 2,574 drugs checked — show the list

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

Showing the 60 most looked-up of 2,574 medications checked with no known interaction — see the full Cesium list.

See the full Cesium interactions page
See every supplement checked against Flutamide, ranked by severity
Evidence & sources

Cesium References

The 9 references that drive our Cesium 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. Sartori HE. Nutrients and cancer: an introduction to cesium therapy. Pharmacol Biochem Behav 1984;21:7-10. PubMed
  2. Neulieb R. Effect of oral intake of cesium chloride: a single case report. Pharmacol Biochem Behav 1984;21:15-6.
  3. Lyon AW, Mayhew WJ. Cesium toxicity: A case of self-treatment by alternate therapy gone awry. Ther Drug Monit 2003;25:114-6. PubMed
  4. Vyas H, Johnson K, Houlihan R, et al. Acquired long QT syndrome secondary to cesium chloride supplement. J Altern Complement Med 2006;12:1011-4. PubMed
  5. Cesium chloride and ventricular arrhythmias. Canadian Adverse Reaction Newsletter 2008;18:3-4.
  6. Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4. PubMed
  7. O'Brien CE, Harik N, James LP, et al. Cesium-induced QT-interval prolongation in an adolescent. Pharmacotherapy 2008;28:1059-65. PubMed
  8. FDA alerts health care professionals of significant safety risks associated with cesium chloride. FDA: Human Drug Compounding. July 23,2018. Available at: https://www.fda.gov/drugs/human-drug-compounding/fda-alerts-health-care-professionals-significant-sa
  9. Public Health Alert Concerning Dietary Supplements Containing Cesium Salts. FDA Dietary Supplement Products & Ingredients. February 5, 2020. Available at: https://www.fda.gov/food/dietary-supplement-products-ingredients/public-health-alert-concerning-diet

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 Cesium and Flutamide Together: Common Questions

Is it safe to take Cesium with Flutamide?
We do not list a known interaction between Cesium and Flutamide. 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 Cesium and Flutamide have any of the same side effects?
Yes — our sources link each of them separately to 3 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.
Are Cesium and Flutamide used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Cesium in each. That is a conversation for your prescriber, especially if Flutamide is being adjusted to a target.
How was the Cesium and Flutamide combination checked?
Interactions in our licensed database are recorded against drug classes. Flutamide is filed under 7 classifications, and Cesium has documented interactions with 3 drug classes — none of Flutamide'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 Cesium interact with any other medications?
Yes. Cesium has 255 documented drug interactions in our database — Flutamide 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 Flutamide interact with any supplements?
Yes. Flutamide has documented interactions with 189 supplements in our database — Cesium is not one of them. The Flutamide 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

Cesium monograph Uses, safety profile, and every drug interaction in one place Flutamide drug information The full plain-English guide to this medication Flutamide supplement interactions Every supplement checked against Flutamide, 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 9 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Flutamide and Cesium?

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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.