The FDA's latest effort to end the use of antibiotics as growth promoters in animals is getting mixed reviews from activists. Rob Carr/AP hide caption

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Lipitor, and other cholesterol-fighting drugs like it, will carry new instructions about risks. Paul Sakuma/AP hide caption

toggle caption Paul Sakuma/AP

The FDA hasn't approved a new weight-loss drug since 1999. In the meantime, Americans' waistlines have continued to grow. M. Spencer Green/AP hide caption

toggle caption M. Spencer Green/AP

Many hospitals are perilously close to running out of a form of methotrexate that's necessary to inject in high doses to treat certain forms of cancer. hide caption

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When it comes to taking up residence in your intestines, Clostridium difficile, like these, may get some help from common heartburn drugs. Janice Carr/CDC hide caption

toggle caption Janice Carr/CDC

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