I et randomiseret åbent studie (APV30003) med proteasehæmmer- experienced patienter, som havde virologisk svigt (< 2 PI’ er) viste kombinationen med fosamprenavir og ritonavir (700/ 100 mg 2 gange daglig eller 1400/ 200 mg 1 gang daglig) ikke non- inferioritet over for lopinavir/ ritonavir med hensyn til viral suppression målt ved det gennemsnitlige areal under kurven minus baseline (AAUCMB) for plasma HIV- 1 RNA over 48 uger (det primære end- point).
In a randomised open-label study (APV30003) in protease inhibitor experienced patients with virological failure (less than or equal to two PIs) the fosamprenavir with ritonavir combination (700 / 100 mg twice daily or 1400 / 200 mg once daily) did not demonstrate non-inferiority to lopinavir / ritonavir with regard to viral suppression as measured by the average area under the curve minus baseline (AAUCMB) for plasma HIV-1 RNA over 48 weeks (the primary end point).