Obesity Clinical Trial
Official title:
Phentermine/tOpiramate to eND Obesity and Uric Acid Stones Trial (POuND OUT)
The investigator proposes an 18 month, feasibility pilot study, randomizing obese and diabetic individuals with pure uric acid nephrolithiasis (UAN) or mixed calcium oxalate (CO) UAN to either phentermine/topiramate or a pragmatic control group who will remain on their standard medication regimen (citrate salts, allopurinol, diet, etc.).
Mounting evidence indicates that obesity, diabetes mellitus, and kidney stones are inter-connected diseases, particularly uric acid nephrolithiasis (UAN) with or without components of calcium oxalate (CO). Obese or overweight diabetics have a six-fold increased risk to develop UAN/COUAN due to the inability to properly add buffer (ammonium) to urine. Of the FDA approved drugs in the weight loss market, the combination medication phentermine/ topiramate is the most effective and has a unique side effect of alkalinizing the urine (making it less acidic). The hypothesize of this project is that treatment of obese, diabetic patients with phentermine/topiramate will reduce the incidence of UAN/COUAN by 1) direct urinary alkalinization and 2) weight loss. Weight loss will indirectly improve urinary buffering ability through improvement in insulin sensitivity and will decrease renal oxidative stress. The investigative team proposes an 18 month, feasibility pilot study, randomizing 30 obese and diabetic individuals with UAN/COUAN to either phentermine/topiramate (n=20) or a pragmatic control group (n=10) who would remain on standard medication regimen (citrate salts, allopurinol, diet, etc). ;
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