Racivir ® (RCV) is an experimental drug which means it is not approved for use by the United States Food and Drug Administration (FDA), but it can be used in research studies like this one. RCV (Racivir®) is part of a class of drugs known as "Nucleoside Reverse Transcriptase Inhibitors" (NRTIs), which are intended to block a further increase in the amount of HIV virus in the body. Laboratory research suggests that RCV (Racivir®) may be effective in patients who have developed resistance to other NRTIs, particularly 3TC (lamivudine, Epivir®). However, a study of RCV (Racivir®) has not been done with patients who have previously been treated with other HAART (Highly Active Antiretroviral Therapy -- taking multiple HIV drugs at once) medications including 3TC (lamivudine, Epivir®). The purpose of this study is to evaluate the safety and effectiveness of RCV (Racivir®) when used together with other HIV drugs in people who have previously been treated with 3TC (lamivudine, Epivir®) and are failing with their current HAART treatments. This study will include a total of 60 HIV infected, HAART-experienced subjects currently receiving 3TC (lamivudine, Epivir®) as part of their HAART therapy. The study will take place at approximately 11 study sites in the US and Latin America.

NCT00121979

Conditions

1. HIV Infections

Interventions

1. Drug: Racivir, a non-nucleoside reverse transcriptase inhibitor

MeSH:HIV Infections

- Subjects with T69S insertions. --- T69S ---

Weight gain following antiretroviral therapy (ART) initiation occurs with all modern regimens. Recent real-world reports suggest that integrase strand transfer inhibitor (INSTI)-based ART may be associated with excess weight gain compared to other regimens. Weight gain appears to occur regardless of baseline weight, and is most pronounced among women and minorities, often those at highest risk of obesity-associated comorbidities. INSTI- and TAF-based regimens are now preferred regimens for most persons according to the Department of Health and Human Services ART-Treatment Guidelines. As a result, there is an urgent need to understand the underlying mechanisms for this weight gain. This study aims to understand the changes in energy balance that occur with changes in ART. Participants with HIV who have experienced >10% weight gain on INSTI (bictegravir or dolutegravir-based therapy) will be switched to doravirine for 12 weeks, and then back to their prior INSTI regimen, allowing for assessment of changes in metabolic parameters with drug withdrawal and reintroduction (with no change to NRTI-backbone). Twenty-four hour energy balance will be measured on both regimens during a 24-hour stay using a whole room indirect calorimetry, with a standardized diet. Ultimately, the investigator's goal is to understand the mechanisms of weight gain so that future interventions can most effectively mitigate ART-associated weight changes.

NCT04495348

Conditions

1. HIV-1-infection
2. Weight Gain

Interventions

1. Drug: Doravirine

MeSH:Body Weight Weight Gain

HPO:Increased body weight

- Severe claustrophobia that would limit ability of participant to remain in the whole room calorimeter - Known resistance to any component of the study drugs, including detection of any of the following resistance mutations on prior HIV genotype test (genotype testing not required if not available): Doravirine resistance: V106A, V106I, V106T, V106M, Y188C, Y188H, Y188L, G190E, P225H, F227C, F227L, F227R, M230L, L234I Resistance to NRTIs: K65R, K65E, K65N, T69S (insertion complex), K70E, L74V, Y115F, Q151M, M184I, M184V. --- V106A --- --- V106I --- --- V106T --- --- V106M --- --- Y188C --- --- Y188H --- --- Y188L --- --- G190E --- --- P225H --- --- F227C --- --- F227L --- --- F227R --- --- M230L --- --- L234I --- --- K65R --- --- K65E --- --- K65N --- --- T69S ---