Your body removes excess potassium primarily through your kidneys, which filter your blood and excrete potassium into urine. When this system works well, it handles potassium automatically. When it doesn’t, potassium builds up in your blood, a condition called hyperkalemia. Normal blood potassium sits between 3.5 and 5.0 mEq/L; anything above 5.0 is considered elevated, and levels above 6.5 can be dangerous.
How potassium gets removed depends on how high your levels are and why they’re elevated. The options range from simple dietary changes to hospital-level interventions.
How Your Kidneys Handle Potassium
Your kidneys filter roughly 600 milliequivalents of potassium every day. The vast majority gets reabsorbed back into your blood in the early parts of the kidney’s filtering tubes. Only about 10% of that filtered potassium actually reaches the final stretch of the kidney where the decision is made: keep it or excrete it.
That decision depends on four main factors: how much potassium is already in your blood, the level of a hormone called aldosterone, how much sodium is flowing through the kidney’s distal tubule, and how fast fluid is moving through it. When potassium levels rise, your body increases aldosterone, which tells the kidney to open more potassium channels on the surface of cells lining the tubule. This effectively turns up the dial on potassium excretion. When potassium intake is low, the kidney pulls those channels back inside the cells and breaks them down, conserving what you have.
This is why adequate hydration matters. Higher fluid flow through the kidneys increases the rate at which potassium gets flushed out. Dehydration slows the process.
Dietary Changes That Lower Potassium
For mildly elevated potassium, reducing how much you eat is the first step. High-potassium foods include bananas, oranges, potatoes, tomatoes, spinach, beans, and dairy products. Replacing some of these with lower-potassium options like apples, berries, white rice, pasta, and cabbage can meaningfully reduce your daily intake.
How you cook also makes a difference. Peeling root vegetables, cutting them into small pieces to increase surface area, and boiling them in a large volume of water leaches potassium out of the food and into the cooking water (which you then discard). A “double cooking” method, where you boil, rinse, then boil again, removes even more potassium from most root vegetables than a single boil. Soaking vegetables in water without cooking, on the other hand, does not pull out a meaningful amount of potassium.
Medications That Pull Potassium Out
Potassium Binders
These are oral medications that work in your gut. They bind to potassium in the colon and prevent it from being absorbed into your bloodstream, so it passes out in your stool instead. Two newer options have largely replaced the older treatment (sodium polystyrene sulfonate), which had more side effects.
Patiromer (sold as Veltassa) is a powder mixed into water. It works in the distal colon, swapping calcium ions for potassium ions, and starts working within 4 to 7 hours. Sodium zirconium cyclosilicate (sold as Lokelma) is more selective, targeting potassium specifically while largely leaving magnesium and calcium alone. It exchanges sodium and hydrogen for potassium and can begin working in as little as 1 to 6 hours.
Diuretics
Loop diuretics like furosemide block sodium and chloride absorption in the kidney, which increases urine output and drags potassium along with it. They are commonly used when the goal is to increase potassium excretion through the kidneys, though they only work if your kidneys still have reasonable function. One well-known side effect of these drugs is actually causing potassium levels to drop too low, which is why they’re useful in the opposite scenario.
Medications That Raise Potassium
Sometimes the problem isn’t what you’re eating but what you’re taking. Several common medications cause the body to retain potassium rather than excrete it. The most notable are ACE inhibitors (generic names ending in “-pril,” like lisinopril and ramipril) and ARBs (ending in “-sartan,” like losartan and valsartan). Both are widely prescribed for high blood pressure and kidney disease, and both can raise blood potassium by interfering with aldosterone’s signaling pathway.
NSAIDs (common over-the-counter painkillers like ibuprofen and naproxen), certain potassium-sparing diuretics, and some immunosuppressant drugs can also contribute. If your potassium is elevated and you take any of these, your doctor may adjust the dose or switch to an alternative.
Hospital Treatments for Dangerous Levels
When potassium climbs above 6.0 or 6.5 mEq/L, or when heart rhythm changes appear on an ECG, treatment happens fast. The approach works in layers, each addressing a different part of the problem.
The first priority is protecting the heart. Intravenous calcium doesn’t lower potassium at all, but it stabilizes heart cell membranes within minutes, reducing the risk of a fatal rhythm disturbance. Its effect lasts only 30 to 60 minutes, buying time for the next steps.
The second layer shifts potassium from the blood back into cells. An intravenous combination of insulin and glucose is the standard approach. The insulin drives potassium into cells; the glucose prevents your blood sugar from crashing. This begins working within 20 to 30 minutes and lasts 2 to 6 hours. It doesn’t remove potassium from the body, but it rapidly lowers the level circulating in your blood.
The third layer actually removes potassium from the body entirely. This can involve the potassium binders described above, diuretics if kidney function allows, or dialysis. A conventional hemodialysis session removes an average of about 73 millimoles of potassium, though the amount varies widely depending on the patient and technique. Some advanced dialysis methods can remove more than 300 millimoles in a single session. Dialysis is typically reserved for people whose kidneys can no longer excrete potassium on their own.
Practical Steps for Ongoing Management
If you’ve been told your potassium is high but not dangerously so, the day-to-day approach combines several strategies. Staying well hydrated supports your kidneys’ ability to flush potassium. Choosing lower-potassium foods and using the double-boil method for starchy vegetables reduces how much potassium enters your bloodstream in the first place. Reviewing your medication list with your doctor can identify drugs that are working against you.
Regular blood tests are the only way to track your levels. Potassium doesn’t cause obvious symptoms until it’s high enough to affect your heart or muscles, at which point you might notice weakness, numbness, tingling, or an irregular heartbeat. Most people with mild to moderate elevations feel completely normal, which is why monitoring matters more than symptoms.