PrEP Pill (IMAGE) Brown University Caption Antiretroviral medications -- just one a day -- can help prevent people at high risk for HIV infection from contracting the virus. Credit Alec Tributino/The Miriam Hospital Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.