Patienter, hos hvem hiv var resistent over for fire andre proteasehæmmere, opnåede efter fire uger større fald i virusindholdet ved at få Agenerase kombineret med ritonavir end ved at fortsætte med de proteasehæmmere, de tidligere havde fået:
In the study of adults who had taken protease inhibitors in the past, Agenerase boosted with ritonavir was as effective as other protease inhibitors in reducing viral loads after 16 weeks of treatment: around two thirds of the patients in both groups had viral loads below 400 copies/ ml.