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PrEP, an acronym from Pre-Exposure Prophylaxis, is the use of prescription drugs as a strategy for the prevention of HIV/AIDS by people who do not have HIV/AIDS. It is an optional treatment which may be taken by people who are HIV negative, but who have substantial, higher-than-average risk of contracting an HIV infection. One of PrEP\'s active ingredients, tenofovir disoproxil (TDF), is a nucleotide analog reverse transcriptase inhibitor. TDF effectively blocks HIV from incorporating its genetic material into the host\'s genome, and thus prevents HIV infection.

Pre-exposure prophylaxis is a subclass of prevention of HIV/AIDS. Pre-exposure prophylaxis is an instance of treatment. Pre-exposure prophylaxis approves by Norway. Pre-exposure prophylaxis approves by Canada. Pre-exposure prophylaxis approves by Scotland.

Pre-exposure prophylaxis approves by United States of America. Pre-exposure prophylaxis approves by Belgium. Pre-exposure prophylaxis approves by Switzerland. Pre-exposure prophylaxis approves by Portugal. Pre-exposure prophylaxis approves by Kenya. Pre-exposure prophylaxis approves by Brazil. Pre-exposure prophylaxis approves by South Africa.