Harvard Heart Letter

Daily aspirin prevents dangerous clots

Yet only half the people who should take it, do.

Aspirin is one of the simplest, safest, cheapest — and most effective — ways to prevent a clot-caused heart attack or stroke. It does so by preventing platelets from sticking together in your blood, an early step in clot formation.

You should take a low-dose (81-mg) aspirin a day if

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »