Treatment and/or inhibition of renal dysfunction, disease or disorder in larger mammals, and particularly in humans, especially in human patients suffering from diabetes, using benzazepine-N-acetic acid derivatives which contain an oxo-group in the .alpha.-position to the nitrogen atom and are substituted in position 3 by a 1-(carboxyalkyl)cyclopentylcarbonylamino radical, and/or salts or biolabile esters or physiologically acceptable solvates thereof, and production of pharmaceutical compositions and products suitable for treatment and/or inhibition of renal dysfunction, disease or disorder, particularly in diabetic patients, but also in patients with syndrome X or in patients with a renal dysfunction, disease and/or disorder, which patients are additionally hypertensive, obese, hyperglycemic and/or subject to a metabolic disorder.