- Acceptable stable (initial or second) ARV regimens prior to Screening include 2 NRTIs plus: INI with the exception of ABC/DTG/3TC (either the initial or second cART regimen); NNRTI (either the initial or second cART regimen); Boosted PI (or atazanavir [ATV] unboosted) (either the initial or second PI-based cART regimen).