Sustiva 600, containing 600 mg of the active ingredient efavirenz, is a prescription medication primarily used in the treatment of HIV infection. As part of antiretroviral therapy (ART), it is often combined with other medications to prevent the virus from multiplying, thereby helping to manage the viral load in the body. Efavirenz belongs to a class of drugs known as non-nucleoside reverse transcriptase inhibitors (NNRTIs), which work by directly inhibiting the action of reverse transcriptase, an enzyme crucial for the replication of HIV. By doing so, Sustiva 600 helps to lower the amount of HIV in the blood, maintain the immune system function, and reduce the risk of HIV-related illnesses. It is important for patients to follow their healthcare provider's instructions closely when taking Sustiva 600, as part of a comprehensive HIV treatment regimen.