Vasodilators are medications that help widen blood vessels, which can improve blood flow and lower blood pressure. They work by relaxing the smooth muscles in the walls of blood vessels, allowing them to expand. This can be beneficial for conditions like hypertension and heart failure. Common types of vasodilators include nitroglycerin, hydralazine, and minoxidil. These drugs can be prescribed alone or in combination with other medications to enhance their effectiveness. While they can provide relief from symptoms, they may also have side effects, such as headaches or dizziness, due to changes in blood flow.