11.   Doctors often use air injections to fight TB strains that resist the most commonly used drugs.

12.   It can also be taken with methotrexate, the most commonly used drug, if necessary.

13.   Piero Anversa and colleagues at New York Medical College in Valhalla, N.Y., used drugs to help mice that were induced to have heart attacks.

14.   The drug had few of the side effects that more commonly used drugs create, the researchers said.

15.   The findings offer another clue for doctors struggling with the mystery of HIV therapy and facing increasing evidence that patients are becoming resistant to commonly used drugs.

16.   The more widely used drugs were often cheaper at Wal-Mart, but the mail-order pharmacies generally had lower prices on less common prescriptions.

17.   The patients all received other standard immunosuppressant therapies, including cyclosporine, the most commonly used drug in transplant therapy.

18.   The two men drank together, used drugs and quarreled, prosecutors said in the first trial.

19.   There is the ancient torment, malaria, present now in strains resistant to the commonly used drugs.

20.   They acknowledge that decades of study will be required to determine if these widely used drugs pose a cancer risk for humans.