Fostemsavir (also known as BMS-663068) is an investigational drug that is being studied for the treatment of HIV infection.
Fostemsavir belongs to a class (group) of HIV drugs called entry and fusion inhibitors.2 Entry and fusion inhibitors block HIV from getting into and infecting certain cells of the immune system. This prevents HIV from multiplying and can reduce the amount of HIV in the body.
By attaching to the gp120 protein on the outer surface of HIV, fostemsavir blocks HIV from getting into and infecting the immune cells.3
Fostemsavir is a prodrug, which means that it is an inactive drug. Once taken, a prodrug does not work until the body converts it into an active form. In the body, fostemsavir is converted to temsavir (also known as BMS-626529).