for the DRIVE-SHIFT Study Group Background: Doravirine is a novel, nonnucleoside reverse transcriptase inhibitor with demonstrated efficacy in treatmentnaive adults with HIV-1. Methods: In this open-label, active-controlled, noninferiority trial, adults with HIV-1 virologically suppressed for $6 months on 2 nucleoside reverse transcriptase inhibitors plus a boosted protease inhibitor, boosted elvitegravir, or a non-nucleoside reverse transcriptase inhibitor were randomized (2:1) to switch to once-daily, singletablet doravirine 100 mg with lamivudine 300 mg and tenofovir disoproxil fumarate 300 mg (DOR/3TC/TDF) or to continue their current therapy (Baseline Regimen) for 24 weeks. The primary endpoint was the proportion of participants with HIV-1 RNA ,50 copies/mL (defined by the FDA Snapshot approach), with the primary comparison between DOR/3TC/TDF at week 48 and Baseline Regimen at week 24 and a secondary comparison between the groups at week 24 (noninferiority margin, 28%). Results: Six hundred seventy participants (447 DOR/3TC/TDF, 223 Baseline Regimen) were treated and included in the analyses. At week 24, 93.7% on DOR/3TC/TDF vs 94.6% on Baseline Regimen had HIV-1 RNA ,50 copies/mL [difference 20.9 (24.7 to 3.0)]. At week 48, 90.8% on DOR/3TC/TDF had HIV-1 RNA ,50 copies/mL, demonstrating noninferiority vs Baseline Regimen at week 24 [difference 23.8 (27.9 to 0.3)]. In participants on ritonavirboosted protease inhibitor at entry, mean reductions in fasting LDL-C and non-HDL-C at week 24 were significantly greater for DOR/ 3TC/TDF vs Baseline Regimen (P , 0.0001). Adverse events occurred in 68.9% on DOR/3TC/TDF and 52.5% on Baseline Regimen by week 24, leading to treatment discontinuation in 2.5% and 0.4%, respectively. Conclusions: Switching to once-daily DOR/3TC/TDF is a generally well-tolerated option for maintaining viral suppression in patients considering a change in therapy.