Bay K 8644 is primarily used in research settings to study calcium channels and their role in various physiological processes. It acts as a calcium channel agonist, specifically targeting L-type calcium channels, which are crucial for regulating calcium influx in cells. This compound is often employed in experiments to investigate cardiovascular function, as it enhances the activity of these channels, leading to increased cardiac contractility and vasoconstriction. Additionally, Bay K 8644 is utilized in neuroscience research to explore calcium signaling in neurons, helping to understand its impact on neurotransmitter release and neuronal excitability. Its ability to modulate calcium channels also makes it a valuable tool in studying smooth muscle contraction and the mechanisms underlying hypertension and other cardiovascular disorders.