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Emtricitabine/tenofovir is also used for HIV post-exposure prophylaxis. People who start taking emtricitabine/tenofovir see HIV reduction benefits up to 72 hours after starting, but the medicine must be taken for thirty days after a high-risk sexual event to ensure HIV transmission levels are optimally reduced. [21] [22]
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Raltegravir, sold under the brand name Isentress, is an antiretroviral medication used, together with other medication, to treat HIV/AIDS. [5] It may also be used, as part of post exposure prophylaxis, to prevent HIV infection following potential exposure. [6] It is taken by mouth. [5]
Some of the most well known are antiviral drugs widely used to treat HIV/AIDS, hepatitis C and COVID-19. These protease inhibitors prevent viral replication by selectively binding to viral proteases (e.g. HIV-1 protease) and blocking proteolytic cleavage of protein precursors that are necessary for the production of infectious viral particles.
Other prodrugs for tenofovir have been tested, but TAF is more efficient at refining HIV-1 therapy. It converts intracellularly to TFV diphosphate, which is a metabolite in HIV target cells. [19] Thus, TAF has higher active metabolite concentrations and lower plasma TFV than other Tenofovir prodrugs. [20]
Strong sales of medicines for HIV, the virus that causes AIDS, were one of the drivers behind the company's performance last year, generating 6.44 billion pounds ($8.13 billion) in annual sales.
An equivalent two pill regimen is available in developing countries at a price of about US$1.00 per day, as Gilead Sciences has licensed the patents covering emtricitabine/tenofovir to the Medicines Patent Pool [16] and Merck and Co makes efavirenz available in developing countries at a reduced price.
Fostemsavir may cause a serious condition called immune reconstitution syndrome, similar to other approved drugs for treatment of HIV-1 infection. [8] This condition can happen at the beginning of HIV-1 treatment when the immune system may get stronger and begin to fight infections that have been hidden in the body for a long time. [8]
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