Det er en selektiv hæmmer af spaltningen af HIV- kodede Gag- Pol polyproteiner i virusinficerede celler, hvorved dannelsen af modne, infektiøse viruspartikler forhindres.
It selectively inhibits the cleavage of HIV encoded Gag-Pol polyproteins in virus infected cells, thereby preventing the formation of mature infectious virus particles.