Herb & supplement monograph

Cesium Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated July 2026
What is this page for?

First and foremost: how Cesium interacts with medications. The heart of this page is the interaction list — every drug Cesium is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Cesium is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Cesium Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the risk of a clinically significant Cesium drug interaction is high, and we would treat this as a supplement that does not mix safely with many medications. More than half of the listed interactions are rated major, none are minor, and cesium itself has caused serious heart rhythm problems in real cases.

Interactions deserving the most attention

The clearest concern is combining cesium with QT interval-prolonging drugs. Cesium can lengthen the QT interval on an ECG, and this has led to torsades de pointes, cardiac arrest, and death, so adding other medications with the same heart rhythm effect may raise that danger further. Cesium has also been linked to low potassium in many case reports, so corticosteroids and diuretics, which can also lower potassium, deserve caution as well.

What the rest of the list means

The long list of interacting medications does not mean hundreds of separate problems. It mostly reflects two shared concerns, effects on heart rhythm and on potassium levels, that apply across many drug classes. The potassium interactions are largely theoretical, but cesium's own effect on the heart has been seen in people, which is why so many combinations are flagged as serious.

Check your medications against Cesium

Based on HelloPharmacist’s Cesium interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Cesium

255 medications have a known interaction with Cesium, graded by severity. Select any drug for the full evidence-based detail.

161 major interactions. These combinations can be clinically significant — best avoided, or used only with close professional supervision. Always check with your pharmacist before combining them with Cesium.

2,830 drugs
Aclidinium Bromide, Formoterol Fumarate DihydrateDuaklir Pressair› AdagrasibKrazati› AmiodaroneCordarone, Pacerone› AmisulprideBarhemsys› AmitriptylineElavil› Amitriptyline, ChlordiazepoxideLimbitrol DS› Amitriptyline, PerphenazineEtrafon, Etrafon-A, Etrafon-Forte, Triavil› AripiprazoleAbilify, Abilify Maintena, Abilify Mycite› Aripiprazole LauroxilAristada, Aristada Initio Kit› Arsenic Trioxide (prescription Drug)Trisenox› ArtemetherArtenam, Paluther› AsenapineSaphris, Secuado› AstemizoleHismanal› AzithromycinAzasite, Zithromax, Zmax› BedaquilineSirturo› BepridilVascor› Berotralstat HydrochlorideOrladeyo› Cabotegravir, RilpivirineCabenuva› CeritinibZykadia› ChlorpromazineThorazine, Thorazine Spansules› CisapridePropulsid› ClarithromycinBiaxin, Biaxin XL› CrizotinibXalkori› DasatinibPhyrago, Sprycel› DesipramineDesipramine, Norpramin, Pertofrane› DesvenlafaxineKhedezla, Pristiq› DeutetrabenazineAustedo› DexmedetomidineIgalmi, Precedex› Disopyramide PhosphateNorpace, Norpace CR› DofetilideTikosyn›
Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Cesium combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
The big picture

The kinds of drugs Cesium affects

Every type of medication (drug category) Cesium is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 3 drug categories Cesium interacts with
Qt Interval-prolonging DrugsCorticosteroidsDiuretic Drugs
Qt Interval-Prolonging Drugs

Theoretically, taking cesium concomitantly with other drugs that prolong the QT interval may increase the risk of ventricular arrhythmias and death.
Taking cesium can prolong the QT interval on electrocardiogram (ECG). In many cases, cesium-induced QT prolongation has led to serious adverse effects, including torsades de pointes, cardiac arrest, and death.

Likelihood Probable Evidence D
Corticosteroids

Theoretically, taking cesium concomitantly with other drugs that deplete potassium, such as corticosteroids, may increase the risk of hypokalemia.
Cesium supplements have been associated with hypokalemia in many case reports.

Likelihood Possible Evidence D
Diuretic Drugs

Theoretically, taking cesium concomitantly with other drugs that deplete potassium, such as diuretics, may increase the risk of hypokalemia.
Cesium supplements have been associated with hypokalemia in many case reports.

Likelihood Possible Evidence D
Monograph

Cesium: Uses, Safety & Side Effects

Medically reviewed by · Reviewed July 2026 ·
The bottom line

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.

Part used
Mineral element (cesium chloride salt)
Common forms
Capsules, powders, liquid solutions (often as cesium chloride)
People commonly use it for
  • Marketed as an alternative cancer treatment ('high pH therapy')
  • Claimed to alter tumor pH
  • General 'alkaline' health claims

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallBest avoided

Cesium chloride can cause life-threatening heart rhythm problems and has no proven benefit.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail
BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Cesium is a soft, silvery metal that is one of the chemical elements. In supplements it is usually sold as cesium chloride, a salt. It is not a plant or herb. It is found in tiny amounts in nature, but the cesium used in supplements is made in a lab or processed industrially.

Cesium chloride is marketed mainly as an alternative cancer treatment, sometimes called "high pH therapy." Promoters claim it can make the body or tumors more "alkaline" and stop cancer from growing. These claims are not supported by good scientific evidence, and health authorities have warned about serious harm from using it.

How it works

Supporters claim that cesium enters cancer cells and raises their internal pH (makes them more alkaline), which is supposed to harm the cells. This is the basis of so-called "high pH therapy." These ideas come mostly from laboratory theories and have not been confirmed in well-designed human studies.

What is better understood is how cesium harms the body. Cesium is chemically similar to potassium, an important mineral. It can interfere with the way potassium moves in and out of cells, especially in the heart. This can disturb the heart's electrical signals and lead to dangerous, irregular heartbeats.

Effectiveness

Does Cesium work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 2 uses evaluated
2 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.

For Cesium, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 2 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Cancer
Rating & evidence shown verbatim from Natural Medicines

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.

Insufficient Reliable Evidence To Rate Depression
Rating & evidence shown verbatim from Natural Medicines

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

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

Cesium chloride is not considered safe. It has been linked to serious and sometimes fatal side effects, mainly dangerous heart rhythm problems. The U.S. FDA has warned against products containing cesium chloride sold for cancer or other conditions.

People with heart disease, low potassium, kidney problems, or those taking medicines that affect the heart are at especially high risk. But even healthy people can be seriously harmed.

Pregnancy and breastfeeding: Cesium chloride should be avoided. It can be toxic, and there is no safe established dose. Pregnant and breastfeeding women should not use it.

If you are considering any supplement, talk with your doctor or pharmacist first, and never replace proven medical treatment with cesium.

Side effects

Reported side effects of cesium chloride include:

  • Dangerous irregular heartbeats (including a serious rhythm called QT prolongation and "torsades de pointes")
  • Low potassium levels
  • Nausea, vomiting, and diarrhea
  • Numbness or tingling, often around the mouth
  • Fainting and seizures

Serious cases have led to hospitalization and death. Because of these risks, cesium chloride is not recommended for any use.

Cesium: Reported Adverse Effects

Documented safety reports on Cesium from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

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.

Reports by condition
Anorexia Gastrointestinal

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

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

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.

  1. Lyon AW, Mayhew WJ. Cesium toxicity: A case of self-treatment by alternate therapy gone awry. Ther Drug Monit 2003;25:114-6.
  2. 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.
  3. Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4.
Arrhythmia Cardiovascular

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 syncope with the last episode requiring cardiopulmonary resuscitation. The patient was found to have mild hypokalemia and a prolonged QT interval. In another case, a female patient who took cesium 3 grams daily for several weeks for colon cancer experienced repeated episodes of diarrhea and then numbness or tingling of the lips. The patient was later admitted after an episode of hypotensive syncope and was found to be hypokalemic and disoriented with a prolonged QT interval. Symptoms resolved gradually over several days after cesium was discontinued. Also, an 84-year-old female taking cesium chloride 1 gram three times daily to self-treat renal cancer was hospitalized due to decreased consciousness, ventricular tachycardia, and QT prolongation. In another case, a 62-year-old male taking cesium chloride 1 gram three times daily for prostate cancer experienced hypokalemia, ventricular extrasystoles, syncope, and QT prolongation with torsades de pointes. In this case, the prolonged QT interval with tachyarrhythmia persisted after serum potassium levels normalized. However, the patient recovered once cesium was discontinued. Also, a 16-year-old female taking cesium chloride for hepatocellular carcinoma was hospitalized for syncope, QT prolongation, and then ventricular tachycardia. Symptoms resolved when cesium was discontinued and serum cesium levels normalized.

  1. 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. 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.
  3. Lyon AW, Mayhew WJ. Cesium toxicity: A case of self-treatment by alternate therapy gone awry. Ther Drug Monit 2003;25:114-6.
  4. Cesium chloride and ventricular arrhythmias. Canadian Adverse Reaction Newsletter 2008;18:3-4.
  5. Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4.
  6. O'Brien CE, Harik N, James LP, et al. Cesium-induced QT-interval prolongation in an adolescent. Pharmacotherapy 2008;28:1059-65.
Epilepsy Neurologic/CNS

Orally, cesium has been reported to cause tingling of the lips, hands, and feet. Orally and by injection, cesium can cause seizures and loss of consciousness.

  1. Neulieb R. Effect of oral intake of cesium chloride: a single case report. Pharmacol Biochem Behav 1984;21:15-6.
  2. 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
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.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

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. If you have already used it or are thinking about it, please speak with your doctor or pharmacist right away.

Pregnancy & Breastfeeding

Cesium & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using.

Cesium & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; 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

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

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
Keep reading

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.

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

Brand directory

Brands that make products with Cesium

27 brands in our database make a supplement containing Cesium.

Product directory

Supplement products with Cesium

53 products in our database contain Cesium. Open any to see its full ingredient list and every drug interaction we check.

Pharmacist Counseling Corner

Cesium: Common Questions

What is Cesium used for, and does it work?
People use Cesium for a range of reasons, but according to the Natural Medicines database the current clinical evidence is insufficient to confirm it works for the specific conditions it has been studied for. See the graded list on this page, and talk to your pharmacist or doctor before relying on it for any condition.
Does Cesium interact with prescription medications?
Yes. We list 255 medications with a known interaction with Cesium, including 161 rated major. Use the checker above to see how Cesium interacts with a specific drug.
How are Cesium interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Cesium with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Cesium interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Cesium used for?
It is mainly marketed as an alternative cancer treatment called 'high pH therapy,' but there is no reliable evidence that it works for cancer or any other condition.
Is Cesium safe to take?
No. Cesium chloride can cause dangerous heart rhythm problems, and serious cases have led to hospitalization and death. It should be avoided.
Can I take Cesium instead of standard cancer treatment?
No. There is no proof Cesium treats cancer, and using it in place of proven care can let cancer grow and cause serious harm. Always follow the advice of your cancer care team.
Is Cesium safe during pregnancy or breastfeeding?
No. Cesium chloride is toxic and should be avoided during pregnancy and breastfeeding.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Products that contain Cesium

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