Cilobradine Hydrochloride is primarily used in research settings to study its effects on heart rate and cardiac function. It acts as a selective inhibitor of the "funny" current (If) in the sinoatrial node, which plays a crucial role in regulating heart rhythm. By blocking this current, it helps in understanding mechanisms that control heart rate, making it a valuable tool in cardiovascular research. Additionally, it has been explored for potential therapeutic applications in conditions where heart rate reduction is beneficial, such as angina or certain arrhythmias. However, its clinical use is still under investigation, and it is not yet approved for widespread medical treatment.