Potassium citrate is the potassium salt of citric acid — a compound found naturally in small amounts in citrus fruits but concentrated into supplement and pharmaceutical form for therapeutic use. It serves two roles at once: delivering potassium (an essential mineral for heart and muscle function) and citrate (an alkalizing agent that changes the chemistry of urine). It is one of the few supplements that is also an FDA-approved prescription drug, used specifically for kidney stone prevention and urinary tract acidosis.

When you take potassium citrate, the citrate portion is absorbed and metabolized, which raises the pH of your urine — making it less acidic. This alkaline environment discourages calcium oxalate and uric acid crystals from forming or growing into kidney stones. At the same time, citrate binds directly to calcium in the urine, reducing the amount available to form stones. The potassium component supports normal fluid balance, nerve signaling, and blood pressure regulation throughout the body.

Extended-release tablets are the most common pharmaceutical form (Urocit-K) and are designed to release slowly to minimize stomach side effects. Powder and liquid forms are popular for people who have difficulty swallowing pills or need flexible dosing. Supplement-grade capsules and powders are widely available over the counter at lower doses than prescription versions.

• Kidney stones (calcium oxalate and uric acid)
• Recurrent kidney stone prevention
• Low potassium (hypokalemia)
• High blood pressure
• Bone density and osteoporosis risk
• Gout and high uric acid
• Urinary tract acidosis
• Metabolic acidosis (mild)
• Exercise-related muscle cramps
• Acid-forming diet imbalance

• Recurrent calcium oxalate kidney stones
• Uric acid kidney stone formation
• Bone mineral loss from diet-related acid load
• Gout flares (by promoting uric acid excretion)

• Citrus fruits (lemons, oranges, grapefruit) — Citrus fruits are the richest natural source of dietary citrate. Lemon juice in particular dramatically raises urinary citrate levels, mimicking part of potassium citrate's stone-preventing effect.
• Avocado — One of the highest-potassium whole foods available, avocados also contain some organic acids that support urinary alkalinity.
• Bananas — A well-known potassium source that is easy to eat daily; regular consumption supports healthy potassium levels and blood pressure.
• Sweet potato — High in potassium and naturally alkaline-forming, sweet potatoes support the same electrolyte and acid-buffering goals as potassium citrate.
• Leafy greens (spinach, Swiss chard, kale) — Rich in potassium and produce an alkaline effect after digestion, helping counteract dietary acid load and support kidney health.

• Nausea or stomach upset (especially on an empty stomach)
• Diarrhea or loose stools
• Stomach cramping or bloating
• Hyperkalemia (high potassium) — risk increases with high doses, kidney problems, or certain medications
• Vomiting (with high doses)
• Tingling or weakness in hands or feet (sign of potassium imbalance — stop and seek care)
• Irregular heartbeat (rare; associated with severe hyperkalemia)

• Recommended daily: Over-the-counter supplement: 99–540 mg potassium per dose, 1–3 times daily. Prescription (kidney stones): 10–20 mEq (roughly 1,000–2,000 mg potassium citrate) 2–3 times daily, up to 60–100 mEq/day under medical supervision. Do not exceed prescription-level doses without a doctor's guidance.
• Best time of day: Divide doses across the day — typically with meals and at bedtime — to maintain steady urinary citrate levels and reduce stomach irritation.
• With or without food: Always take with food or immediately after eating. Food significantly reduces nausea and stomach upset and helps the extended-release tablet pass through the digestive tract more smoothly.
• Time to effect: Urine pH shifts within hours of the first dose. Stone prevention benefits accumulate over weeks to months of consistent use. Blood pressure and bone effects take several weeks to become measurable.
• How long to take it: For kidney stone prevention, long-term daily use is typically recommended and monitored with periodic urine and blood tests. For general potassium supplementation, use until levels normalize or as directed. Do not stop abruptly if using prescription doses without consulting your doctor.