Antiretroviral therapies in HIV-1 infection

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Abstract
Recent progress in our understanding of the viral dynamics and immunobiology of HIV infection, coupled with the introduction of a new generation of antiretroviral agents, has led to significant advances in the medical management of HIV infection. Eleven antiretroviral drugs are currently licensed in the United States, and eight are licensed in Europe. These include the nucleoside reverse transcriptase inhibitors (AZT, ddI, ddC, 3TC and d4T); the non-nucleoside reverse transcriptase inhibitors (nevirapine and delavirdine) and the protease inhibitors (saquinavir, indinavir and ritonavir). This report summarises recent developments in the use of antiretroviral therapies and the main treatment strategies under evaluation in current trials. These strategies include the evaluation of novel antiretroviral agents; combinations to achieve maximal viral suppression; optimal sequencing of antiretroviral agents; and subtraction therapy. However, many important issues in the use of antiretroviral therapies remain unresolved, including the optimal role of new agents, such as protease inhibitors (PIs), and the use of triple combination therapy in initial and subsequent treatment regimens; when therapy should be changed; which alternative agents should then be used; and the most appropriate methods for monitoring the efficacy of therapy.

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