Efavirenz was approved by the Food and Drug Administration (FDA) on September 21, 1998, making it the 14th approved antiretroviral drug. Efavirenz (brand name sustiva) is an orally active, non-nucleoside reverse transcriptase inhibitor (nnRTI) that is specific for human immunodeficiency virus, type1 (HIV-1). Efavirenz has a terminal half-life of 52-76 hours after a single dose and 40-55 hours after multiple dosing. It is used together with other antiretrovirals to delay the progression of HIV infection. By doing this, your immune system should improve (increase in CD4+ count) and you will be...