Human Immunodeficiency Virus (HIV) is a viral infection that attacks the body's immune system.  If left untreated HIV can eventually progress to AIDS (Acquired Immunodeficiency Syndrome) which is when the body's ability to fight off infections is severely diminished.  Initially, patients may be asymptomatic and unaware of their infection. As the infection progresses to AIDS patients may experience fatigue, weight loss, rashes, and the development of severe infections. 

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Unfortunately, there is no cure for HIV, however, studies now show that life expectancy for HIV patients is in line with average life expectancy in healthy individuals when the HIV virus remains suppressed. There are several drug regimens that are available and are listed below based on the different classes of medications.