By pre-treating with grapefruit juice prior to taking protease inhibitors the GI intake and therefore the bioavailabity is increased.
baɪ pɹˈiːtɹˈiːɾɪŋ wɪð ɡɹˈeɪpfɹuːt dʒˈuːs pɹˈaɪɚ tə tˈeɪkɪŋ pɹˈoʊɾeɪs ɪnhˈɪbɪɾɚz ðə dʒˌiːˈaɪ ˈɪnteɪk ænd ðˈɛɹfoːɹ ðə bˌaɪoʊɐveɪlˈæbᵻɾi ɪz ɪŋkɹˈiːst.