BAY u 3405 is primarily utilized in research settings, particularly in studies involving the cardiovascular system. It is known for its potential role in investigating the mechanisms of blood pressure regulation and vascular function. Researchers often employ it to explore its effects on smooth muscle contraction and relaxation, which are critical in understanding hypertension and related conditions. Additionally, it has been studied for its potential application in the development of therapeutic agents targeting cardiovascular diseases. Its use in experimental models helps in elucidating pathways that could be modulated for better management of heart and vascular health.