NCT00004284

Who might be able to join this trial:

• You have been diagnosed with a condition called "absorptive hypercalciuria," meaning your intestines absorb too much calcium from food
• Tests show your body releases an unusually high amount of calcium into your urine after eating calcium-rich foods, or a special calcium absorption test came back above a certain level
• You pass more than 200 mg of calcium in your urine per day, even when eating a low-calcium diet
• Your fasting urine calcium levels are normal or high
• Your blood calcium levels are normal
• Your parathyroid hormone (a hormone that controls calcium) is at a normal level in your blood
• You have had at least one calcium oxalate kidney stone within the past 3 years
• Your kidneys are functioning at an adequate level (confirm with trial site)

Who may not be able to join:

• You have a condition called primary hyperparathyroidism (an overactive parathyroid gland)
• Your kidney stones are made of certain other materials, such as struvite, carbonate apatite, or non-calcium-based substances
• You have so many kidney stones that they cannot be counted or measured accurately
• You have a kidney condition called renal tubular acidosis
• You are currently taking any medication to treat kidney stones
• You have high potassium or high phosphate levels in your blood
• You have a urinary tract infection
• You are taking certain medications that can raise potassium levels, such as potassium-sparing diuretics, ACE inhibitors (a type of blood pressure medication), or anti-inflammatory painkillers (like ibuprofen)
• You have an active stomach ulcer
• You have ongoing, long-term diarrhea

Important: Always verify eligibility with the trial site directly before applying.