AUTHOR=Mulligan Nikki, Schalkwijk Stein, Best Brookie M., Colbers Angela, Wang Jiajia, Capparelli Edmund V., Moltó José, Stek Alice M., Taylor Graham, Smith Elizabeth, Hidalgo Tenorio Carmen, Chakhtoura Nahida, van Kasteren Marjo, Fletcher Courtney V., Mirochnick Mark, Burger David TITLE=Etravirine Pharmacokinetics in HIV-Infected Pregnant Women JOURNAL=Frontiers in Pharmacology VOLUME=7 YEAR=2016 URL=https://www.frontiersin.org/articles/10.3389/fphar.2016.00239 DOI=10.3389/fphar.2016.00239 ISSN=1663-9812 ABSTRACT=Background: The study goal was to describe etravirine pharmacokinetics during pregnancy and postpartum in HIV-infected women.Methods: IMPAACT P1026s and PANNA are on-going, non-randomized, open-label, parallel-group, multi-center phase-IV prospective studies in HIV-infected pregnant women. Intensive steady-state 12-h pharmacokinetic profiles were performed from 2nd trimester through postpartum. Etravirine was measured at two labs using validated ultra performance liquid chromatography (detection limits: 0.020 and 0.026 mcg/mL).Results: Fifteen women took etravirine 200 mg twice-daily. Etravirine AUC0–12 was higher in the 3rd trimester compared to paired postpartum data by 34% (median 8.3 vs. 5.3 mcg*h/mL, p = 0.068). Etravirine apparent oral clearance was significantly lower in the 3rd trimester of pregnancy compared to paired postpartum data by 52% (median 24 vs. 38 L/h, p = 0.025). The median ratio of cord blood to maternal plasma concentration at delivery was 0.52 (range: 0.19–4.25) and no perinatal transmission occurred.Conclusion: Etravirine apparent oral clearance is reduced and exposure increased during the third trimester of pregnancy. Based on prior dose-ranging and safety data, no dose adjustment is necessary for maternal health but the effects of etravirine in utero are unknown. Maternal health and infant outcomes should be closely monitored until further infant safety data are available.Clinical Trial registration: The IMPAACT protocol P1026s and PANNA study are registered at ClinicalTrials.gov under NCT00042289 and NCT00825929.