The combination of lamivudine and zidovudine is used along with other medications to treat human immunodeficiency virus (HIV) infection. Lamivudine and zidovudine are in a class of medications called nucleoside reverse transcriptase inhibitors (NRTIs). They work by decreasing the amount of HIV in the blood. Although the combination of lamivudine and zidovudine does not cure HIV, it may decrease your chance of developing acquired immunodeficiency syndrome (AIDS) and HIV-related illnesses such as serious infections or cancer. Taking these medications along with practicing safer sex and making other life-style changes may decrease the risk of transmitting (spreading) the HIV virus to other people.
Atazanavir and ritonavir are antiretroviral medications that act by preventing multiplication of the human immunodeficiency virus (HIV). Atazanavir and ritonavir are used in combination with other antiretroviral drugs to slow progression of the disease. They help to keep your immune system strong and reduce the risk of developing infections that occur when the immune system is weak (opportunistic infections)
Atazanavir and ritonavir do not cure AIDS or kill the virus. There is a permanent risk of transmitting HIV either through sexual or blood contact. It is therefore essential that precautions always be taken (use latex condoms, do not share syringes).