Bepridil hydrochloride is primarily used as a calcium channel blocker in the treatment of angina pectoris. It helps by relaxing the blood vessels and reducing the heart's workload, thereby improving blood flow and oxygen supply to the heart muscle. This makes it effective in preventing chest pain associated with angina. Additionally, it has been explored for its antiarrhythmic properties, particularly in managing certain types of irregular heartbeats, such as atrial fibrillation or ventricular tachycardia, due to its ability to stabilize heart rhythm. However, its use is limited due to potential side effects and the availability of safer alternatives. It is typically prescribed when other treatments are not effective or suitable.