 This is a phase IV, open label, multicentre trial that will be taking place at 4 sites in the United Kingdom UK. Efavirenz which is taken in combination with Kivexa or as part of the combination pill, Atripla is a recommended firstline regimen for the treatment of Human Immunodeficiency Virus-1 HIV- 1 infection. Treatment against the HIV virus is also referred to as antiretroviral therapy. 