Potassium Citrate: Uses, Benefits, Dosage & Safety
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Quick summary
Potassium citrate is a prescription treatment for preventing certain kidney stones and a supplemental potassium source. It is the one electrolyte where careless supplementation carries genuine danger — hyperkalaemia can cause cardiac arrhythmia.
What is Potassium Citrate?
The potassium salt of citric acid. Medically it is used to alkalinise urine and raise urinary citrate, which inhibits calcium stone formation. As a supplement, over-the-counter potassium is legally capped at 99 mg per serving in many countries — a deliberate safety limit.
What Potassium Citrate is commonly used for
Prevention of calcium oxalate and uric acid kidney stones, correcting potassium shortfall, and blood pressure support as part of adequate dietary potassium.
How Potassium Citrate works
Citrate binds calcium in urine, reducing the calcium available to form stones, and raises urinary pH which discourages uric acid stones. The potassium itself contributes to blood pressure regulation, largely by opposing sodium's effects on vascular tone and fluid volume.
What the evidence says
Each claim below is tied to the specific study behind it, rather than to a general reading list.
- Potassium citrate reduces recurrence of calcium oxalate kidney stones. Barcelo et al., Journal of Urology, 1993 — randomised, double-blind, placebo-controlled trial. (PubMed)
- Increased potassium intake reduces blood pressure in adults with hypertension. Aburto et al., BMJ, 2013 — systematic review and meta-analysis. (PubMed)
- Hyperkalaemia risk rises with reduced kidney function and RAAS-blocking medication. Clinical nephrology guidance on potassium management. (PubMed)
Typical dosage used in studies
Prescription doses for stone prevention are far higher than supplemental ones. Adequate dietary potassium is around 3,500–4,700 mg daily, which is best met through food — potatoes, beans, leafy greens, bananas and dairy.
Side effects and safety
This one warrants real caution. Hyperkalaemia causes cardiac arrhythmia and can be fatal. Risk rises sharply with reduced kidney function, and the 99 mg over-the-counter cap exists because of it. Gastrointestinal irritation and ulceration have occurred with high-dose potassium tablets.
Medication interactions and who should avoid Potassium Citrate
Medication & safety check
Do not combine supplemental potassium with ACE inhibitors, ARBs, spironolactone, amiloride or other potassium-sparing diuretics without medical supervision. Anyone with reduced kidney function should not supplement potassium at all without a doctor's involvement.
General information, not personal medical advice. If you take any medication, confirm it is safe to combine with Potassium Citrate with your doctor or pharmacist first.
Sources & further reading
The claim-level citations above are drawn from these sources:
- Barcelo et al., Journal of Urology, 1993 — randomised, double-blind, placebo-controlled trial — find on PubMed
- Aburto et al., BMJ, 2013 — systematic review and meta-analysis — find on PubMed
- Clinical nephrology guidance on potassium management — find on PubMed
- NIH Office of Dietary Supplements
- NIH National Center for Complementary and Integrative Health
Frequently asked questions
Is over-the-counter potassium enough for stones?
No — stone prevention uses prescription doses far above the 99 mg supplemental cap. That is a conversation with a urologist.
Can I take it with blood pressure medication?
Not without asking. ACE inhibitors, ARBs and potassium-sparing diuretics all raise potassium. Adding more can cause dangerous hyperkalaemia.
Is food potassium safer?
Considerably, because absorption is slower and the amounts are physiological. Diet is the right route for most people.
Where you'll find Potassium Citrate
Potassium Citrate appears in Minerals & Kidney Health formulas. Browse the supplement guides to see the products we review, each with a full breakdown of formula, pricing and safety.
Related ingredients to explore
Ingredients often studied or formulated alongside Potassium Citrate.
General information, not medical advice.