In vitro er de forskellige isoformer af cytochrome P- 450, inklusive CYP3A, CYP2C19/ C9 og CYP2D6 ansvarlige for metaboliseringen af nelfinavir.
In vitro, multiple cytochrome P-450 isoforms including CYP3A, CYP2C19/C9 and CYP2D6 are responsible for metabolism of nelfinavir.