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Maraviroc Pharmacokinetics in HIV-1-Infected Pregnant Women

Tags: | July 22nd, 2015

Authors: Colbers A, Best B, Schalkwijk S, et al. PANNA Network and the IMPAACT 1026 Study Team.

Published in: Clin Infect Dis. 2015; 61(10):1582-1589.

Objective To describe the pharmacokinetics of maraviroc in human immunodeficiency virus (HIV)–infected women during pregnancy and post partum.

Methods HIV-infected pregnant women receiving maraviroc as part of clinical care had intensive steady-state 12-hour pharmacokinetic profiles performed during the third trimester and ≥2 weeks after delivery. Cord blood samples and matching maternal blood samples were taken at delivery. The data were collected in 2 studies: P1026 (United States) and PANNA (Europe). Pharmacokinetic parameters were calculated.

Results Eighteen women were included in the analysis. Most women (12; 67%) received 150 mg of maraviroc twice daily with a protease inhibitor, 2 (11%) received 300 mg twice daily without a protease inhibitor, and 4 (22%) had an alternative regimen. The geometric mean ratios for third-trimester versus postpartum maraviroc were 0.72 (90% confidence interval, .60–.88) for the area under the curve over a dosing interval (AUCtau) and 0.70 (0.58–0.85) for the maximum maraviroc concentration. Only 1 patient showed a trough concentration (Ctrough) below the suggested target of 50 ng/mL, both during pregnancy and post partum. The median ratio of maraviroc cord blood to maternal blood was 0.33 (range, 0.03–0.56). The viral load close to delivery was <50 copies/mL in 13 women (76%). All children were HIV negative at testing.

Conclusions Overall maraviroc exposure during pregnancy was decreased, with a reduction in AUCtau and maximum concentration of about 30%. Ctroughwas reduced by 15% but exceeded the minimum Ctrough target concentration. Therefore, the standard adult dose seems sufficient in pregnancy.