Dilated cardiomyopathy refers to a disease characterized by an enlarged heart, especially significant enlargement of the left ventricle, along with a severe reduction in the heart's ejection fraction. Those diagnosed with dilated cardiomyopathy generally require long-term, and possibly lifelong, medication management. This includes diuretic medications such as furosemide or spironolactone, and β-blocker agents such as metoprolol or bisoprolol. These medications can effectively improve symptoms of heart failure caused by dilated cardiomyopathy, enhance quality of life, and even extend lifespan. Therefore, it is crucial for patients with dilated cardiomyopathy to take medications as prescribed by a doctor and not to discontinue them arbitrarily.