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Truvada was previously only approved by the U.S. Food and Drug Administration (FDA) to treat HIV in those already infected. In 2012, the FDA approved the drug for use as pre-exposure prophylaxis (PrEP), based on growing evidence that the drug was safe and effective at preventing HIV in populations at increased risk of infection. [41]
Pre-exposure prophylaxis (PrEP) provides HIV-negative individuals with medication—in conjunction with safer-sex education and regular HIV/STI screenings—in order to reduce the risk of acquiring HIV. [40] In 2011, the journal Science gave the Breakthrough of the Year award to treatment as prevention. [41]
Pre-exposure prophylaxis (PrEP), is the use of medications to prevent the spread of disease in people who have not yet been exposed to a disease-causing agent. Vaccination is the most commonly used form of pre-exposure prophylaxis ; other forms of pre-exposure prophylaxis generally involve drug treatment, known as chemoprophylaxis .
The drug works by inhibiting reverse transcriptase, the enzyme that copies HIV RNA into new viral DNA. By interfering with this process, which is central to the replication of HIV, emtricitabine can help to lower the amount of HIV, or " viral load ", in a patient's body and can indirectly increase the number of immune system cells (namely T ...
Efavirenz is not effective against HIV-2, as the pocket of the HIV-2 reverse transcriptase has a different structure, which confers intrinsic resistance to the NNRTI class. [ 20 ] As most NNRTIs bind within the same pocket, viral strains which are resistant to efavirenz are usually also resistant to the other NNRTIs, nevirapine and delavirdine .
Using male or female condom during sex, [5] being tested for HIV and sexually transmitted infections, [5] having a voluntary medical male circumcision, [5] using harm reduction services for people who inject and use drugs, [5] antiretroviral drugs (ARVs) (including oral Pre-exposure prophylaxis (PrEP) and long acting products, [5] dapivirine ...
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