What does OBR stand for?

Optimized Background Regimen (used in HIV treatment)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

Houston, TX) confirm that humanized monoclonal antibody TNX 355, when used in combination with an optimized background regimen (OBR) of antiretroviral drugs, produced a sustained virologic response in treatment-experienced HIV patients through 48 weeks.

Data confirm durable response of HIV antibody

In all three arms, patients received either ATC or 3TC as part of an optimized background regimen.

Positive Outcome Reached at 16 Weeks for Avexa's ATC Phase III Trial