functional obsolescence. Impairment of the usefulness of a device or equipment due to a design defect, or due to its inability to be upgraded or modified to serve the user's current needs.efinition. Impairment of the usefulness of a device or equipment due to a design defect, or due to its inability to be upgraded or modified to serve the user's current needs. For example, a relatively new computer becomes functionally obsolete if it cannot run the latest program or peripheral the user wishes to use.
Current US DHHS guidelines (published April 8, 2015) state: 1  Antiretroviral therapy (ART) is recommended for all HIV-infected individuals to reduce the risk of disease progression. 2  ART also is recommended for HIV-infected individuals for the prevention of transmission of HIV.
Efavirenz/emtricitabine/tenofovir, sold under the trade name Atripla among others, is a medication used to treat HIV/AIDS. It is a fixed-dose combination of efavirenz, emtricitabine, and tenofovir disoproxil. It can be used by itself or together with other antiretroviral medications. It is taken by mouth once a day.