NEFECON is an add-on treatment to other medications for nephropathy symptoms and kidney function, including ACEI and/or ARBs. Rigorous blood pressure control will be achieved over a 6-month Run-in Phase in which ACEI and/or ARB will be dosed to target a blood pressure of <130/80 mm Hg and UPCR <0.5 g/g. Patients who complete the Run-in Phase, and despite optimized ACEI and/or ARB therapy, have a UPCR ≥0.5 g/g OR urine protein ≥0.75 g/24hr will be eligible for randomization and entry into the treatment phase of the trial. Patients will remain on their ACEI and/or ARB dosing regimen for the duration of the trial.