Drug & supplement interaction

Cesium + Peginterferon alfa-2b

Peginterferon alfa-2b brand names: Peg-Intron, ViraferonPeg.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Cesium and Peginterferon alfa-2b 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

Cesium and Peginterferon alfa-2b

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 Peginterferon alfa-2b 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 Peginterferon alfa-2b and Cesium? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Peginterferon alfa-2b

Interactions in our licensed database are recorded against drug classes, not just single drug names. Peginterferon alfa-2b is filed under a single classification — hepatotoxic 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 Peginterferon alfa-2b’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 — Peginterferon alfa-2b 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. Peginterferon alfa-2b)
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

What Cesium Itself Has Been Linked To

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

  • Low potassium / An irregular heartbeat Worth acting on Additional detail

    “Orally and by injection, cesium has been associated with hypokalemia. In multiple case reports, patients presented with hypokalemia and arrhythmia that resolved after discontinuation of cesium supplementation. It is not clear whether these reports of hypokalemia were due to a direct effect of cesium on potassium channels.”

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

    3 sources cited
    1. 12178. Lyon AW, Mayhew WJ. Cesium toxicity: A case of self-treatment by alternate therapy gone awry. Ther Drug Monit 2003;25:114-6. PubMed
    2. 15262. 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
    3. 16690. Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4. PubMed
  • Fainting / Seizures Worth acting on Additional detail

    “Orally and by injection, cesium chloride has been associated with arrhythmias such as ventricular tachycardia, QT prolongation, cardiac arrest, seizures, and death. There are at least 23 reports of cardiotoxicity or death in patients taking cesium supplements.

    In one case report, a healthy 39-year-old female taking an unknown amount of cesium chloride as part of a "detoxification" program developed three episodes of…”

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

    6 sources cited
    1. 101651. 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
    2. 15262. 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
    3. 12178. 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. 16689. Cesium chloride and ventricular arrhythmias. Canadian Adverse Reaction Newsletter 2008;18:3-4.
    5. 16690. Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4. PubMed
    6. 16691. O'Brien CE, Harik N, James LP, et al. Cesium-induced QT-interval prolongation in an adolescent. Pharmacotherapy 2008;28:1059-65. PubMed
  • A fast or pounding heartbeat Additional detail

    Recorded for Cesium in the same Natural Medicines adverse-effect record shown under Fainting / Seizures above.

  • Numbness or tingling Additional detail

    Recorded for Cesium in the same Natural Medicines adverse-effect record shown under Low potassium / An irregular heartbeat above.

  • Reduced appetite Additional detail

    “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.
  • Diarrhea / Nausea Additional detail

    Recorded for Cesium in the same Natural Medicines adverse-effect record shown under Low potassium / An irregular heartbeat above.

Everything above comes from the Natural Medicines adverse-effect record for Cesium — expand a row for the licensed statement it rests on. We haven’t matched Peginterferon alfa-2b to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Peginterferon alfa-2b.

Overlapping uses

What Peginterferon alfa-2b 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. Peginterferon alfa-2b 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.

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 Peginterferon alfa-2b 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 Peginterferon alfa-2b

This page covers Cesium only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Peginterferon alfa-2b page lists 38 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Beer (major), Siberian Cocklebur (major), Wine (major), Ashwagandha (moderate) and Black Cohosh (moderate).

By severity: 3 major · 35 moderate.

From our pharmacist’s overview on the Peginterferon alfa-2b page

“Someone taking peginterferon alfa-2b (Peg-Intron) is usually treating hepatitis C, so the liver is already the organ under strain, and all 38 supplement interactions on file for this drug pile additional liver stress on top of it. That earns genuine caution.”

Reviewed by 2 · Jul 18, 2026

Open the Peginterferon alfa-2b 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 Peginterferon alfa-2b, 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 Peginterferon alfa-2b 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
Steady interest

#1,004 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Peginterferon alfa-2b
Steady interest

#2,716 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 13, 2026. The Cesium and Peginterferon alfa-2b 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 Peginterferon Alfa-2b (PEG-Intron)

What Is Peginterferon Alfa-2b (PEG-Intron) Used For?

Brand names: Peg-Intron, ViraferonPeg

  • Peginterferon alfa-2b is used alone or in combination with ribavirin (a medication) to treat chronic (long-term) hepatitis C infection (swelling of the liver caused by a virus) in people who show signs of liver damage and who have not been treated with interferon alpha (medication similar to peginterferon alfa-2b) in the past. Peginterferon alfa-2b is in a class of medications called interferons. Peginterferon alfa-2b is a combination of interferon and polyethylene glycol, which helps the interferon stay active in your body for a longer period of time. Peginterferon alpha-2b works by decreasing the amount of hepatitis C virus (HCV) in the body. Peginterferon alfa-2b may not cure hepatitis C or prevent you from developing complications of hepatitis C such as cirrhosis (scarring) of the liver, liver failure, or liver cancer. Peginterferon alfa-2b may not prevent the spread of hepatitis C to other people.

See full Peginterferon Alfa-2b (PEG-Intron) 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 Peginterferon alfa-2b, 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 Peginterferon alfa-2b Together: Common Questions

Is it safe to take Cesium with Peginterferon alfa-2b?
We do not list a known interaction between Cesium and Peginterferon alfa-2b. 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.
Are Cesium and Peginterferon alfa-2b 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 Peginterferon alfa-2b is being adjusted to a target.
How was the Cesium and Peginterferon alfa-2b combination checked?
Interactions in our licensed database are recorded against drug classes. Peginterferon alfa-2b is filed under 1 classification, and Cesium has documented interactions with 3 drug classes — none of Peginterferon alfa-2b'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 — Peginterferon alfa-2b 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 Peginterferon alfa-2b interact with any supplements?
Yes. Peginterferon alfa-2b has documented interactions with 38 supplements in our database — Cesium is not one of them. The Peginterferon alfa-2b 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 Peginterferon Alfa-2b (PEG-Intron) drug information The full plain-English guide to this medication Peginterferon alfa-2b supplement interactions Every supplement checked against Peginterferon alfa-2b, 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 Peginterferon alfa-2b 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.