Semotiadil (racemate fumarate) is primarily used in cardiovascular research due to its calcium channel-blocking properties. It helps in studying the mechanisms of hypertension and other heart-related conditions by inhibiting calcium influx in vascular smooth muscle cells, leading to vasodilation and reduced blood pressure. This makes it a valuable tool in experimental models for understanding and developing treatments for cardiovascular diseases. Additionally, its effects on calcium channels are explored in neurological studies to investigate potential applications in conditions like stroke or neurodegenerative disorders.