i was recently told by my doctor that trace amounts of protein were found in my urine. i have had a long history of kidney stones, over 10 yrs and have been seen a urologist for kidney stones. could the trace amounts of protein in my urine be connected to the nephrolithisis? my md (not my urologist) prescribed an ace inhibitor benazipril 10 mg to protect my kidneys from damage, and said the the trace amounts of protein in my urine may be due to the kidney stones. is this the usual therapy and should i worry about renal failure?