Rentiapril is primarily used in the field of medical research and pharmaceuticals, particularly in the study and treatment of cardiovascular diseases. It functions as an angiotensin-converting enzyme (ACE) inhibitor, which helps in managing high blood pressure by relaxing blood vessels. This makes it valuable in the development of therapies aimed at reducing the risk of heart attacks, strokes, and kidney problems in patients with hypertension or heart failure. Additionally, Rentiapril is utilized in preclinical studies to understand the mechanisms of ACE inhibitors and their effects on the renin-angiotensin system, contributing to advancements in cardiovascular drug development.