Important Notes - Learn about PEP and PrEP: If you think that you've been recently exposed to HIV (i.e. within 72 hours), seek out PEP (Post-Exposure Prophylaxis). It's a month-long treatment to prevent HIV infection after exposure, and it may be available in your city. Take PEP as soon as possible. For more information, click here. If you are at risk of HIV exposure, seek out PrEP (Pre-Exposure Prophylaxis). It's a daily oral pill that can prevent HIV infection before exposure. To learn more about PrEP, click here.