High Dose Ace Inhibitor Therapy Versus Combination of ACE and ARB Therapy

Inclusion Criteria: 1. Early diabetic nephropathy as defined by proteinuria between 500mg/24hr and 3g/24hr and GFR\>50ml/min (as calculated by the Cockcroft-Gault formula), in the absence of clinical and laboratory evidence of other non-diabetic renal disease. 2. Controlled blood pressure (\<150/\<90) 3. Able to give informed consent 4. Between the ages of 18 and 75 5. Must be capable of providing a 24 hour urine collection 6. Negative BHcG test for ruling out pregnancy in women of childbearing age 7. Currently taking an angiotensin converting enzyme inhibitor \- Exclusion Criteria: 1. Creatinine clearance \<50ml/min or 24hour protein excretion \>3gm/d. 2. Hypotension as defined by the inability to add an ARB or increase ACE-I dose secondary to hypotensive symptomatology or a systolic Bp \<100mmHg. 3. Serum potassium \>5.5 on two separate occasions in the previous six months 4. Previous adverse reaction to angiotensin receptor antagonist medication 5. Use of NSAIDS including COX2 inhibitors 6. Pregnant or nursing women will be excluded 7. Currently taking an angiotensin receptor antagonist \-