Cardiovascular drugs can be classified into four types: Anticoagulants: They are the most commonly used drugs for the prevention of thromboembolic disease. Anti-platelet agents: They are used to reduce the number of blood clots that form on blood vessels and reduce the risk of stroke and heart attack. Anti-arrhythmics: They are used to prevent or control heart rhythm disorders such as atrial fibrillation. Antihypertensives: They are used to lower blood pressure and decrease the risk of heart attack and stroke.