Objective: Dolutegravir, an integrase inhibitor replaced nevirapine or efavirenz (both NRTIs) in a fixed dose combination with Tenofovir/Lamivudine, as the preferred first-line option for the prevention and treatment of HIV infection. This study aimed to assess the treatment outcomes of the new Tenofovir/Lamivudine/Dolutegravir (TLD) regimen at the Federal Medical Centre Abeokuta. Methods: This retrospective study used data drawn from the treatment register of patients who transitioned from Tenofovir/Lamivudine/Efavirenz (TLE) to TLD. Data were analyzed using SPSS v23. Descriptive statistics were used to describe categorical and continuous variables. Statistically significant independent variables in univariate analyses were included in the multivariate model. The level of significance was set at p