Raltegravir is an antiretroviral medication used to treat HIV (human immunodeficiency virus) infection. It belongs to a class of drugs known as integrase inhibitors, which work by blocking the virus's ability to integrate its genetic material into the host's DNA. This helps to reduce the viral load in the body, allowing the immune system to recover and function more effectively. Approved by the U.S. Food and Drug Administration (FDA) in 2007, raltegravir is often used in combination with other antiretroviral medications as part of a comprehensive treatment plan. It is typically taken as a tablet or chewable form, making it easier for patients to adhere to their treatment regimen.