There is little information about the risk of treatment failure after a switch from human immunodeficiency virus (HIV) protease inhibitors (PIs) to nevirapine (Nvp) for patients with successful virus suppression. This study compared the 1-year risk of treatment failure for patients switching from a first PI-containing antiretroviral regimen to Nvp (Nvp group) with the risk for patients switching to second-line PIs (PI group) in the ATHENA (AIDS Therapy Evaluation, The Netherlands) study cohort (n=2470) whose HIV-1 RNA loads were < or = 500 copies/mL. Treatment failure was defined as measurement of HIV-1 RNA loads >500 twice or >10,000 copies/mL once or discontinuation of treatment for any reason.
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