Ivabradine HCl is primarily used in the treatment of chronic heart failure and stable angina pectoris. It works by selectively inhibiting the If current in the sinoatrial node, which helps to lower the heart rate without affecting myocardial contractility or blood pressure. This makes it particularly beneficial for patients who cannot tolerate beta-blockers or for whom beta-blockers are contraindicated. By reducing the heart rate, it decreases the oxygen demand of the heart, thereby alleviating symptoms of angina and improving exercise capacity. In heart failure patients, it has been shown to reduce the risk of hospitalization due to worsening heart failure. It is often prescribed as part of a comprehensive treatment plan that includes lifestyle changes and other medications.