Saquinavir  PI  P-gp substrate. MRP-1 and MRP-2 substrate. BCRP inhibitor. Possible OCT1 and OCT2 inhibitor  Kim et al. (1998), Polli et al. (1999), Park and Sinko (2005), Janneh et al. (2005, 2007), Eilers et al. (2008), Gupta et al. (2004), Jung et al. (2008)