Bepridil hydrochloride hydrate is primarily used in the treatment of angina pectoris, a condition characterized by chest pain due to reduced blood flow to the heart. It functions as a calcium channel blocker, helping to relax and widen blood vessels, which improves blood flow and reduces the heart's workload. This medication is particularly effective in managing chronic stable angina and may also be used in certain cases of arrhythmias due to its ability to stabilize heart rhythms. Additionally, it has been investigated for its potential in treating other cardiovascular conditions, although its use is often limited by side effects and the availability of alternative treatments. Proper medical supervision is essential when using this drug to monitor for adverse effects and ensure optimal therapeutic outcomes.