Vasodilators are medications that open (dilate) the blood vessels. As a result, the heart  does not need to work as hard to pump blood through the blood vessels. Because there is less force in the blood vessels, blood pressure is lowered. Therefore, vasodilators are often prescribed to treat high blood pressure (hypertension), as well as to relieve symptoms associated with congestive heart failure.

Patients who are taking vasodilators are usually encouraged by their physician to make healthy lifestyle changes to help control their blood pressure. These lifestyle changes include eating a heart-healthy diet, getting regular exercise and practicing stress management techniques.

In addition to making healthy lifestyle changes, patients are generally encouraged to avoid other vasodilators, excessive alcohol use and grapefruit juice. All of these substances have been associated with very low blood pressure (hypotension) when used by people who are taking vasodilators.

In general, vasodilators (especially ACE inhibitors) should be avoided by women who are pregnant or breast feeding. Children and the elderly may also face special considerations when taking this type of medication.