REYATAZ, also known by its generic name atazanavir, is a prescription medication used in the treatment of human immunodeficiency virus (HIV) infection. It belongs to a class of drugs known as protease inhibitors, which work by blocking the protease enzyme that HIV needs to replicate within the body. By inhibiting this enzyme, REYATAZ helps to decrease the amount of HIV in the blood, thereby improving the immune system's ability to fight off infections. It is often used in combination with other antiretroviral medications as part of an antiretroviral therapy (ART) regimen to effectively manage HIV in infected individuals. While REYATAZ does not cure HIV or AIDS, it plays a crucial role in managing the condition and preventing the progression to AIDS when taken as prescribed.