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Schematic description of the mechanism of the four classes of available antiretroviral drugs against HIV. There are six classes of drugs, which are usually used in combination, to treat HIV infection. Antiretroviral (ARV) drugs are broadly classified by the phase of the retrovirus life-cycle that the drug inhibits. Typical combinations include ...
[10] [11] A virus with Q151M complexed with the other four mutations becomes highly resistant to the above drugs, and is additionally resistant to lamivudine (3TC) and emtricitabine (FTC). [11] [12] The second mechanism is the excision or the hydrolytic removal of the incorporated drug or pyrophosphorolysis. This is a reverse of the polymerase ...
Protease inhibitors were the second class of antiretroviral drugs developed. The first members of this class, saquinavir , ritonavir , and indinavir , were approved in late 1995–1996. Within 2 years, annual deaths from AIDS in the United States fell from over 50,000 to approximately 18,000 [ 5 ] Prior to this the annual death rate had been ...
Non-nucleoside reverse-transcriptase inhibitors (NNRTIs) are antiretroviral drugs used in the treatment of human immunodeficiency virus . NNRTIs inhibit reverse transcriptase (RT), an enzyme that controls the replication of the genetic material of HIV. RT is one of the most popular targets in the field of antiretroviral drug development. [1]
AZT was usually dosed twice a day in combination with other antiretroviral therapies. This approach is referred to as Highly Active Antiretroviral Therapy and is used to prevent the likelihood of HIV resistance. [11] [12] As of 2019, the standard is a three-drug once-daily oral treatment that can include AZT. [13]
Currently, appearance of drug resistant viruses is an inevitable consequence of prolonged exposure of HIV-1 to antiretroviral therapy. Drug resistance is a serious clinical concern in treatment of viral infection, and it is a particularly difficult problem in treatment of HIV. [25] Resistance mutations are known for all approved NRTIs. [26]
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