According to WHO Antiretroviral therapy (ART) is the treatment of people infected with the human immunodeficiency virus (HIV) with anti-HIV drugs. Treatment consists of a combination of at least three drugs (commonly called “highly active antiretroviral therapy” or HAART) that suppress HIV replication. A combination of three drugs is used to reduce the likelihood of developing resistance. ART reduces mortality and morbidity among people infected with HIV, and improves their quality of life. The benefits of ART also include prevention of HIV transmission by suppressing virus replication in people living with HIV.