________ is a medicine used to fight HIV infection

Answer 1

According to the world wide web, there are 3. 1)Non-nucleoside reverse transcriptase inhibitors 2)reverse transcriptase inhibitors and 3)protease inhibitors.

I would say the simple answer is generally "Inhibitors"

Answer 2

http://www.google.com/#q=+medicine+used+to+fight+HIV+infection