What the benefits of 21-day antiretroviral regimens during pregnancy?

Updated: Jul 27, 2020
  • Author: Shelley A Gilroy, MD, FACP, FIDSA; Chief Editor: Michael Stuart Bronze, MD  more...
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In a study of 484 HIV-infected pregnant women, 3 short-term antiretroviral strategies, initiated simultaneously with the administration of single-dose nevirapine (sdNVP), resulted in a low rate (1.2%) of new NVP-resistance mutations. In the study, HIV-infected pregnant women were randomized to receive sdNVP and either zidovudine/lamivudine (3TC), tenofovir/emtricitabine (FTC), or lopinavir/ritonavir for either 7 or 21 days. According to the results, 21-day antiretroviral regimens are better at preventing the emergence of minor NVP resistance variants compared to 7-day regimens. Of the 412 women who had primary endpoint results available, 4 of 215 in the 7-day arms had new NVP resistance (1.9%), whereas only 1 of 197 (0.5%) in the 21-day arms exhibited the same resistance. [131]

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