Explanation: "Taking aspirin may help prevent further heart attacks."

Why is this important?: "Blood clots can block blood vessels. Aspirin can help prevent blood clots from forming or help dissolve blood clots that have formed. Following a heart attack, continued use of aspirin may help reduce the risk of another heart attack. Aspirin can have side effects like stomach inflammation, bleeding, or allergic reactions. Talk to your health care provider before using aspirin on a regular basis to make sure it's safe for you."

Taking from the Center for Medicaid and Medicare Services: Hospital Information for Consumers

http://www.hospitalcompare.hhs.gov/Hospital/Static/ConsumerInformation_tabset.asp?activeTab=2&language=English&version=default