Patients who have had a heart attack are sometimes prescribed the blood thinner Plavix to reduce the risk of having another heart attack.
But a new study shows common acid reflux drugs may block the effectiveness of Plavix.
The drugs are known as proton pump inhibitors... such as Prevacid and Prilosec.
The study shows out of thousands patients, those who had a second heart attack were 27-percent more likely to be taking one those drugs for reflux.
The FDA is looking into the issue, and urging doctors to do the same.
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