FDA Not Backing Aspirin for Prevention of Sudden Cardiac Events.
After carefully examining available scientific data from major studies, the United States Food and Drug Administration (FDA) has concluded that even though daily low-dose aspirin can help ward of heat attack or stroke, it is not for everyone. The agency believes the case has yet to be made for using low-dose aspirin to prevent an initial heart attack or stroke. Bottom-line: If you have not had a heart attack or stroke, there is no known benefit of using low dose aspirin for prevention. However, people who have had a heart attack, stroke or cardiovascular problems, daily aspirin therapy is worth considering.
Food and Drug Administration, May 2014