Some people taking the blood thinner Plavix on top of aspirin to try to prevent heart attacks, as many doctors recommend, now have good reason to stop. The drug combination not only didn't help most people in a newly released study, but it unexpectedly almost doubled the risk of death, heart attack or stroke for those with no clogged arteries but with worrisome conditions like high blood pressure and high cholesterol.

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• MedPage: Conference: Plavix same as aspirin for heart