Only one common type of kidney stone can truly be dissolved with medication: uric acid stones. Calcium oxalate stones, which make up roughly 80% of all kidney stones, cannot be dissolved by any drug or remedy currently available. So the real answer to “how to dissolve a kidney stone” depends entirely on what kind of stone you have, how big it is, and where it’s sitting in your urinary tract.
Why Most Kidney Stones Can’t Be Dissolved
Calcium oxalate stones are by far the most common type of kidney stone, and no medication, supplement, or home remedy can dissolve them once they’ve formed. They can be broken apart with shock waves or lasers, but that’s fragmentation, not dissolution. The University of Chicago Kidney Stone Program puts it bluntly: there are no remedies based on current or past research that dissolve calcium oxalate stones inside the body.
This matters because many people searching for ways to dissolve a kidney stone assume there’s a universal solution. There isn’t. If you don’t know your stone type, that’s the first thing to figure out. Your doctor can often determine this through urine testing, blood work, or by analyzing a stone you’ve already passed.
Dissolving Uric Acid Stones
Uric acid stones are the exception. They form when urine is too acidic (low pH), and they can genuinely be dissolved by making your urine more alkaline. The standard treatment is potassium citrate, taken by mouth, which raises urinary pH to a target of 6.0 or above. According to the American Urological Association, persistent alkalinization of the urine can dissolve existing uric acid stones, but the medication needs to be taken consistently throughout the day to keep the pH elevated.
This isn’t a quick fix. Dissolving a uric acid stone can take weeks to months depending on its size, and you’ll need regular monitoring to make sure your urine pH stays in the right range without going too high (which could encourage a different type of stone to form). If alkalinization alone doesn’t work, a medication that reduces uric acid production may be added as a second-line option.
Passing Small Stones Without Surgery
For stones that can’t be dissolved, the next best outcome is passing them naturally. Most stones smaller than 5 to 6 millimeters will eventually pass on their own, though the experience ranges from mildly uncomfortable to intensely painful depending on the stone’s size and location.
Alpha-blocker medications are sometimes prescribed to relax the muscles in the ureter (the tube connecting your kidney to your bladder) and help the stone move along. Research on their effectiveness is mixed. A large, high-quality trial found that the passage rate with an alpha-blocker was 50%, compared with 47% for a placebo, a difference that wasn’t statistically meaningful. However, for stones between 6 and 10 millimeters, alpha-blockers did shorten the time to passage by about 6 days on average. So they may help more with larger stones that are still in the passable range.
The most important thing you can do while waiting to pass a stone is drink enough fluid to produce at least 2.5 liters of urine per day. That volume keeps urine dilute and helps push the stone through. For pain, anti-inflammatory medications like ibuprofen are considered first-line treatment. A Cochrane review found that anti-inflammatories were at least as effective as opioids for kidney stone pain, with fewer side effects.
When Stones Need to Be Broken Up or Removed
Stones that are too large to pass, causing persistent pain, or blocking urine flow typically need a procedure. The two most common options are shock wave lithotripsy and ureteroscopy.
Shock wave lithotripsy uses focused sound waves from outside the body to break a stone into smaller fragments that can then pass naturally. It’s noninvasive and works well for stones 1 centimeter or smaller. For stones between 1 and 2 centimeters in the lower part of the kidney, it’s less reliable, with a success rate around 58%.
Ureteroscopy involves passing a thin, flexible scope through the urethra and bladder up into the ureter or kidney. A laser at the tip breaks the stone into tiny pieces or dust. For stones in the 1 to 2 centimeter range, ureteroscopy has a success rate around 81%, making it the preferred option for larger stones. For stones under 1 centimeter, both approaches are considered equally effective first-line treatments.
Very large stones (over 2 centimeters) or complex cases may require a procedure called percutaneous nephrolithotomy, where a small incision is made in the back to access the kidney directly.
Infection Stones Are a Special Case
Struvite stones form in the presence of chronic urinary tract infections caused by specific bacteria. These stones can grow rapidly and become quite large. While surgical removal is the primary treatment, a medication called acetohydroxamic acid can slow their regrowth by blocking the bacterial enzyme that drives stone formation. In a clinical trial of spinal cord injury patients, this medication reduced the proportion of patients whose stones grew within 12 months from 60% to 33%. The trade-off is significant side effects: 62% of patients on the medication reported them, though all were reversible.
Dietary Changes That Reduce New Stones
Once you’ve dealt with a current stone, preventing the next one is the real goal. About half of people who form a kidney stone will form another within five to ten years without changes.
Fluid intake is the single most important factor. The goal is producing at least 2.5 liters of urine daily, which for most people means drinking roughly 3 liters of fluid. Water is the best choice, but lemonade made from real lemons offers a modest additional benefit. In a clinical study, lemonade therapy increased urinary citrate (a natural stone inhibitor) by about 203 milligrams per day and boosted urine volume by roughly 760 milliliters per day. Potassium citrate combined with lemonade was even more effective, raising citrate by 346 milligrams per day. The takeaway: lemon water helps, but it’s not a substitute for medication if your doctor has prescribed potassium citrate.
If you’ve had calcium oxalate stones, reducing high-oxalate foods can help. The NIDDK identifies the top offenders as spinach, rhubarb, nuts and nut products, peanuts, and wheat bran. You don’t necessarily need to eliminate these entirely, but cutting back makes a difference. Counterintuitively, you should not reduce calcium intake. Dietary calcium actually binds to oxalate in the gut and prevents it from reaching the kidneys. Low-calcium diets tend to increase stone risk, not decrease it.
Reducing sodium matters too. High salt intake increases the amount of calcium in your urine, directly raising stone risk. Keeping sodium under 2,300 milligrams per day (about one teaspoon of table salt) is a standard recommendation for stone formers. Moderating animal protein also helps, since high protein intake makes urine more acidic and raises both calcium and uric acid levels.