Form Comparison

Potassium Chloride vs Potassium Citrate

How potassium chloride and potassium citrate differ in elemental content, absorption, tolerance, and cost.

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Quick verdict. Citrate is metabolized to bicarbonate and alkalinizes the urine, which is why prescription potassium citrate prevents calcium oxalate and uric acid kidney stones. Chloride replaces chloride along with potassium, which is what low potassium from diuretics or vomiting needs, since those losses come with metabolic alkalosis that citrate would worsen. Choose citrate for stone prevention and chloride for diuretic or vomiting-related losses.

Side by Side

Potassium Chloride Potassium Citrate
Elemental content 52.4% elemental potassium 36.2% elemental potassium
Absorption High High
How it is absorbed Fully soluble and nearly completely absorbed. Replaces chloride as well as potassium, which matters when diuretics or vomiting cause metabolic alkalosis. Fully soluble and nearly completely absorbed. Citrate is metabolized to bicarbonate, which alkalinizes the urine.
Typical dose 99 mg per OTC tablet; 10-40 mEq daily by prescription 99 mg per OTC capsule; 15-60 mEq daily by prescription
Common uses diuretic-induced hypokalemia, salt substitutes kidney stone prevention, general supplementation
Side effects Concentrated tablets can irritate or ulcerate the GI tract; prescription forms are wax-matrix or microencapsulated. GI irritation at higher doses.
Cost Low Low
Also called KCl, salt substitute tripotassium citrate
Labels in index 65 188

When to Choose Potassium Chloride

Choose potassium chloride when low potassium comes with alkalosis, as with diuretics. The form used to correct low potassium in medicine and the main ingredient in salt substitutes.

Potassium Chloride

The form that corrects diuretic-induced low potassium, and the main ingredient of salt substitutes.

What to look for: Prescription extended-release tablets for a measured deficit. Salt substitutes only with normal kidney function and no interacting drugs.

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When to Choose Potassium Citrate

Choose potassium citrate when you want an alkalinizing potassium source or have a history of kidney stones. Prescription extended-release citrate (Urocit-K) prevents calcium oxalate and uric acid stones.

Potassium Citrate

The alkalinizing form, and the prescription choice for stone prevention.

What to look for: As a supplement, 99 mg per capsule with the citrate form named. Prescription extended-release for stones.

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Products on Titrate

In Titrate's index of NIH label data, 65 labels named as potassium products list potassium chloride and 188 list potassium citrate.

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Potassium does not have its own search category yet. Each product above links to its full label in the NIH database.

Related

References

NIH Office of Dietary Supplements. Potassium: Fact Sheet for Health Professionals.

Cook NR, Obarzanek E, Cutler JA, et al. Joint effects of sodium and potassium intake on subsequent cardiovascular disease: the Trials of Hypertension Prevention follow-up study. Arch Intern Med. 2009;169(1):32-40.

Aburto NJ, Hanson S, Gutierrez H, Hooper L, Elliott P, Cappuccio FP. Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses. BMJ. 2013;346:f1378.

Neal B, Wu Y, Feng X, et al. Effect of salt substitution on cardiovascular events and death. N Engl J Med. 2021;385(12):1067-1077.