Studies have found that aspirin may be just as effective as more expensive medications, like Warfarin, at preventing heart attacks and stroke. The study was very large, consisting of over 2000 participants. They found that there was a slight difference between the two medications, but they were not statistical different. However, it was found that Warfarin was more effective for patients who were on the medication for more than 4 years. This could be very beneficial to people, since aspirin is over-the-counter, while Warfarin has to be prescribed by a doctor and is much more expensive.
http://medicaldaily.com/news/20120503/9753/aspirin-warfarin--heart-failure-stroke-brain-hemorrhage-prescription-drugs.htm
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