Diabetic nephropathy is a common cause of end stage renal failure. Pat
ients ultimately require dialysis or transplantation and endure a poor
quality of life in association with increased mortality. Due to the q
uantitative significance of this problem there is also a considerable
financial burden. It has been generally accepted that one nephropathy
is established it is irreversible although aggressive anti-hypertensiv
e treatment can delay its progression. More recently there have been n
umerous reports proposing a specific renal protective role of certain
drugs. In this article we review the current literature on the use of
angiotensin converting enzyme inhibitors in diabetic nephropathy. Ther
e is strong evidence that the use of ACE inhibitors in diabetic nephro
pathy (in the presence or absence of hypertension) slows the progressi
on of deterioration in renal function and may even arrest its progress
ion if detected at the microproteinuric stage.