Nephropathy means involvement of kidney in a disease process. You have chronic allograft nephropathy which is a mixture of chronic rejection and other factors like drugs, high blood pressure, recurrent disease affecting the transplant kidney. It needs optimising immunosuppressive drugs & taking care of all other factors which affect kidney function. Losartan & enalapril decrease protein in urine and control blood pressure and are good for kidney. Your doctor should discuss your diet.