Among many risk factors for the progression of glomerulonephritis, heavy proteinuria, and systemic and/or glomerular hypertension are considered to be major factors in the progression to end-stage renal failure (ESRF). Thus, the main purpose of treatment is to improve the proteinuria and hypertension in patients with glomerulonephritis. Therapy of chronic glomerulonephritis including IgA nephropathy consists of a protein and salt restricted diet, antiplatelet drugs (dilazep hydrochloride, dipyridamole), corticosteroids, immunosuppressants and antihypertensive drugs. Treatment with angiotensin converting enzyme inhibitors (ACEIs), angiotensin II receptor antagonists (AIIRA) and/or Ca antagonists is usually used in such patients as renoprotective therapy. Further study of combination therapy, i.e. ACEI plus AIIRA or ACEI plus Ca antagonist, is needed to determine renoprotective effects by means of multicenter trials of patients with glomerulonephritis including IgA nephropathy.