31.   The drug does so by inhibiting the action of an enzyme called protease that is crucial to HIV reproduction.

32.   The man I know used it before meals only because alternative legal drugs did not do the trick.

33.   The two approved drugs can do no more than stave off decline for a few months, and only for some people.

34.   The traditional anti-HIV drugs such as AZT do so by blocking an enzyme the virus needs to copy its genetic material into the host DNA.

35.   There is no discussion of some interesting new ideas such as harm reduction, which focuses on programs like needle exchanges and methadone that cut the damage drugs do.

36.   They said people may misunderstand what the drug does and fail to evacuate when ordered to.

37.   When I was a daily caffeine consumer, the drug did little or nothing to keep me awake when I really had to stay awake.

38.   Drugs often do little to relieve bone cancer pain and can cause problems such as drowsiness, difficulty thinking and severe constipation.

39.   Finally, Sterling scientists knew what their target looked like, and it quickly became apparent what their research drug was doing.

40.   It can only add to what drugs do.