1.   At that point, they are put on other drug combinations.

2.   Nineteen had used only one drug prior to heroin use, principally cannabis, the rest using a variety of drug combinations.

3.   And they cautioned that a drug combination hailed this week for eradicating tumors in mice may not work as well in humans.

4.   And research will highlight the effects of different drug combinations.

5.   And that has many health specialists worried about potential abuses and untested drug combinations, among other things.

6.   Another is that many of the participants at the conference were doctors who treat infected people for whom the drug combinations have not worked as well.

7.   As a result, Sherif said, doctors are sometimes slow to recognize dangerous drug combinations.

8.   Beach Warren, for instance, went through numerous drugs and drug combinations, but most worked for only six months to a year before the virus developed resistance.

9.   Before trying experimental treatments, doctors tried every other drug combination they could think of to help her.

10.   Biotech stocks fell even as reports from an AIDS conference in Vancouver, British Columbia, showed various drug combinations are proving effective in slowing the virus.