81.   Poretsky said he used Glucophage first and added Rezulin only when the drug did not work.

82.   Researchers do not even know how the drug works.

83.   Results showed that the drug works at least as well and probably better than other treatments for neuropathic pain, but with far fewer side effects.

84.   Scientists still cannot tell whether a drug will work or be toxic until they test it.

85.   Roche was unable to show in its study of CellCept that the drug worked better than Imuran, sold by Glaxo Wellcome plc.

86.   She said she had no idea why the drugs worked against these microbes.

87.   Since dangerous side effects did not appear to be a risk, the question was whether the drug worked.

88.   Similarly, major pharmaceutical and biotechnology companies are looking to genetic testing to understand which drugs work best for some people and not for others.

89.   Sometimes, though, the drugs work so well that multiple eggs mature.