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Open Access Publications from the University of California

Elvitegravir/cobicistat pharmacokinetics in pregnant and postpartum women with HIV.

  • Author(s): Momper, Jeremiah D
  • Best, Brookie M
  • Wang, Jiajia
  • Capparelli, Edmund V
  • Stek, Alice
  • Barr, Emily
  • Badell, Martina L
  • Acosta, Edward P
  • Purswani, Murli
  • Smith, Elizabeth
  • Chakhtoura, Nahida
  • Park, Kyunghun
  • Burchett, Sandra
  • Shapiro, David E
  • Mirochnick, Mark
  • IMPAACT P1026s Protocol Team
  • et al.

OBJECTIVE:To evaluate elvitegravir and cobicistat pharmacokinetics during pregnancy compared with postpartum and in infant washout samples after delivery. DESIGN:Nonrandomized, open-label, parallel-group, multicenter phase-IV prospective study of antiretroviral pharmacokinetics in HIV-infected pregnant women and their children in the United States. METHODS:Intensive steady-state 24-h pharmacokinetic profiles after 150 mg of elvitegravir and 150 mg of cobicistat given orally in fixed dose combination once-daily were performed during the second trimester, third trimester, and postpartum. Infant washout samples were collected after birth. Elvitegravir and cobicistat were measured in plasma by a validated liquid chromatography with tandem mass spectrometry assay with a lower quantitation limit of 10 ng/ml. A two-tailed Wilcoxon signed-rank test (α = 0.10) was employed for paired within-participant comparisons. RESULTS:Thirty pregnant women taking elvitegravir and cobicistat once-daily enrolled in the study. Compared with paired postpartum data, elvitegravir AUC0-24 was 24% lower in the second trimester [n = 14, P = 0.058, geometric mean ratios (GMR) = 0.76, 90% confidence interval (CI) 0.57-1.0] and 44% lower in the third trimester (n = 24, P = 0.0001, GMR = 0.56, 90% CI 0.42-0.73), while cobicistat AUC0-24 was 44% lower in the second trimester (n = 14, P = 0.0085, GMR = 0.56, 90% CI 0.37-0.85) and 59% lower in the third trimester (n = 24, P < 0.0001, GMR = 0.41, 90% CI 0.30-0.57). Median cord blood elvitegravir concentration was 540.6 ng/ml and the median ratio of cord blood to maternal plasma elvitegravir concentrations was 0.91. CONCLUSION:Standard elvitegravir and cobicistat dosing during pregnancy results in significantly lower exposure which may increase the risk of virologic failure and mother-to-child transmission. Additional studies are needed to optimize elvitegravir and cobicistat dosing regimens in pregnant women.

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