High treatment success rates when switching to once daily nevirapine containing antiretroviral therapy.

INTRODUCTION: Two recent studies have highlighted low rates of virological response to once daily nevirapine containing combination antiretroviral therapy (CART) in treatment naïve HIV-1 infected subjects. AIM: We assessed factors associated with treatment responses in a cohort of HIV-1 infected, therapy naïve individuals, commencing nevirapine CART with two nucleoside reverse transcriptase inhibitors (NRTI) containing either lamivudine or emtricitabine. RESULTS: Between January 2002 and 2006, 173 subjects (80 female) met the study inclusion criteria. All subjects initially commenced on twice daily nevirapine with six different NRTI backbones. Mean follow up was 802 days. 49 (28%) subjects switched to once daily nevirapine, 23 (13%) within the first year. After 48 weeks of therapy, HIV RNA was < 50 copies/mL in 154/173 subjects (89%). A trend was observed towards improved virological outcome (HIV RNA < 50 copies/mL) and switching to once daily nevirapine during the first year of therapy (p=0.051). CONCLUSION: Whilst awaiting the results of prospective studies assessing once daily nevirapine, our data describe high treatment success rates and good safety responses when switching to once daily nevirapine