Zantac and its generic version found with chemical that could lead to cancer

There are increasing concerns about the popular heartburn drug Zantac and its generic version because of a chemical that could lead to cancer. Three large pharmacy chains in the U.S. recently pulled the drugs off shelves, following an FDA alert about an "impurity" in the medication. Dr. Jon LaPook recently spoke to two groups of researchers who suspect the problem could be serious for consumers.

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