Atomic number 55, Caesium, Cesio, Césium, Cesium-137, Cesium Carbonate, Cesium Chloride, Chlorure de Césium, Cs, CsCl, High pH Therapy, Numéro Atomique 55, Traitement à pH élevé.


Overview Information

Cesium is an element. In its natural state, cesium is not radioactive. However, it can be made radioactive in the laboratory. The US Food and Drug Administration (FDA) warns against the use of cesium as medicine due to concerns for severe heart toxicity and death.

Despite serious safety concerns, non-radioactive cesium is used for cancer. This is sometimes called "high pH therapy." According to people who promote high pH therapy, taking cesium chloride by mouth raises the pH of tumor cells. But there is no good scientific evidence to back up these claims or support this use.

Healthcare providers sometimes treat cancer patients with radioactive cesium (cesium-137).

In industry, radioactive cesium is used in instruments that measure thickness, moisture, and liquid flow.

How does it work?

There isn't enough information to know how cesium might work. Some people who promote "high pH therapy" say cesium affects the pH (acidity) of cancer cells, but there's no scientific research to support this claim.


Uses & Effectiveness?

Insufficient Evidence for

  • Cancer. Cesium is unsafe. The risks of using it are greater than any possible benefit.
  • Depression.
  • Other conditions.
More evidence is needed to rate the effectiveness of cesium for these uses.

Side Effects

Side Effects & Safety

When taken by mouth: Cesium is LIKELY UNSAFE when taken by mouth. There are reports of severe life-threatening low blood pressure, irregular heartbeat, and death in some people who took cesium. Some people who take cesium by mouth can also have nausea, diarrhea, and loss of appetite. Tingling of the lips, hands, and feet may also occur.

When given by IV or as a shot: Cesium is LIKELY UNSAFE when injected into the body. There are reports of severe life-threatening low blood pressure, irregular heartbeat, and death in some people who took cesium.

Special Precautions & Warnings:

Pregnancy and breast-feeding: There isn't enough reliable information to know if cesium is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use.

Irregular heartbeat: Cesium might make an irregular heartbeat worse. Don't use cesium if you have this condition.



Major Interaction

Do not take this combination

  • Medications that can cause an irregular heartbeat (QT interval-prolonging drugs) interacts with CESIUM

    Cesium might cause an irregular heartbeat. Taking cesium along with medications that can cause an irregular heartbeat might cause serious side effects including heart arrhythmias.

    Some medications that can cause an irregular heartbeat include amiodarone (Cordarone), disopyramide (Norpace), dofetilide (Tikosyn), ibutilide (Corvert), procainamide (Pronestyl), quinidine, sotalol (Betapace), thioridazine (Mellaril), and many others.

Moderate Interaction

Be cautious with this combination

  • Medications for inflammation (Corticosteroids) interacts with CESIUM

    Some medications for inflammation can decrease potassium in the body. Cesium might also decrease potassium levels in the body. Taking cesium along with some medications for inflammation might decrease potassium in the body too much.

    Some medications for inflammation include dexamethasone (Decadron), hydrocortisone (Cortef), methylprednisolone (Medrol), prednisone (Deltasone), and others.

  • Water pills (Diuretic drugs) interacts with CESIUM

    Large amounts of cesium can decrease potassium levels in the body. "Water pills" can also decrease potassium in the body. Taking cesium along with "water pills" might decrease potassium in the body too much.

    Some "water pills" that can deplete potassium include chlorothiazide (Diuril), chlorthalidone (Thalitone), furosemide (Lasix), hydrochlorothiazide (HCTZ, Hydrodiuril, Microzide), and others.



The appropriate dose of cesium depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for cesium. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.

View References


  • Cesium chloride and ventricular arrhythmias. Canadian Adverse Reaction Newsletter 2008;18:3-4.
  • Environmental Protection Agency. Cesium. 2002. Available at: www.epa.gov/radiation/radionuclides/cesium.htm
  • 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-safety-risks-associated-cesium-chloride.
  • Lyon AW, Mayhew WJ. Cesium toxicity: A case of self-treatment by alternate therapy gone awry. Ther Drug Monit 2003;25:114-6. View abstract.
  • Neulieb R. Effect of oral intake of cesium chloride: a single case report. Pharmacol Biochem Behav 1984;21:15-6. View abstract.
  • O'Brien CE, Harik N, James LP, et al. Cesium-induced QT-interval prolongation in an adolescent. Pharmacotherapy 2008;28:1059-65. View abstract.
  • Pinsky C, Bose R. Pharmacological and toxicological investigations of cesium. Pharmacol Biochem Behav 1984;21:17-23. View abstract.
  • Pinter A, Dorian P, Newman D. Cesium-induced torsades de pointes. N Engl J Med 2002;346:383-4. View abstract.
  • 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-dietary-supplements-containing-cesium-salts.
  • Sartori HE. Cesium therapy in cancer patients. Pharmacol Biochem Behav 1984;21:11-3. View abstract.
  • Sartori HE. Nutrients and cancer: an introduction to cesium therapy. Pharmacol Biochem Behav 1984;21:7-10. View abstract.
  • 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. View abstract.

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CONDITIONS OF USE AND IMPORTANT INFORMATION: This information is meant to supplement, not replace advice from your doctor or healthcare provider and is not meant to cover all possible uses, precautions, interactions or adverse effects. This information may not fit your specific health circumstances. Never delay or disregard seeking professional medical advice from your doctor or other qualified health care provider because of something you have read on WebMD. You should always speak with your doctor or health care professional before you start, stop, or change any prescribed part of your health care plan or treatment and to determine what course of therapy is right for you.

This copyrighted material is provided by Natural Medicines Comprehensive Database Consumer Version. Information from this source is evidence-based and objective, and without commercial influence. For professional medical information on natural medicines, see Natural Medicines Comprehensive Database Professional Version.
© Therapeutic Research Faculty 2018.