Document Detail

Therapeutic drug monitoring of lopinavir/ritonavir in pregnancy.
MedLine Citation:
PMID:  20726906     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: The aim of the study was to determine total and unbound lopinavir (LPV) plasma concentrations in HIV-infected pregnant women receiving lopinavir/ritonavir (LPV/r tablet) undergoing therapeutic drug monitoring (TDM) during pregnancy and postpartum.
METHODS: Women were enrolled in the study who were receiving the LPV/r tablet as part of their routine prenatal care. Demographic and clinical data were collected and LPV plasma (total) and ultrafiltrate (unbound) concentrations were determined in the first, second and third trimesters using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Postpartum sampling was performed where applicable. Antepartum and postpartum trough concentrations (C(trough) ) were compared independently [using analysis of variance (anova)] and on a longitudinal basis (using a paired t-test).
RESULTS: Forty-six women were enrolled in the study (38 Black African). Forty women initiated LPV/r treatment in pregnancy. Median (range) gestation at initiation was 25 (15-36) weeks and median (range) baseline CD4 count and viral load were 346 (14-836) cells/μL and 8724 (<50-267408) HIV-1 RNA copies/mL, respectively. Forty women (87%) had LPV concentrations above the accepted minimum effective concentration for wild-type virus (MEC; 1000 ng/mL). Geometric mean (95% confidence interval [CI]) total LPV concentrations in the first/second [3525 (2823-4227) ng/mL; n=16] and third [3346 (2813-3880) ng/mL; n=43] trimesters were significantly lower relative to postpartum [5136 (3693-6579) ng/mL; n=12] (P=0.006). In a paired analysis (n=12), LPV concentrations were reduced in the third trimester [3657 (2851-4463) ng/mL] vs. postpartum (P=0.021). No significant differences were observed in the LPV fraction unbound (fu%). Conclusions The above target concentrations achieved in the majority of women and similarities in the fu% suggest standard dosing of the LPV/r tablet is appropriate during pregnancy. However, reduced LPV concentrations in the second/third trimesters and potentially compromised adherence highlight the need for TDM-guided dose adjustment in certain cases.
Js Lambert; Lj Else; V Jackson; J Breiden; S Gibbons; L Dickinson; Dj Back; M Brennan; Eo Connor; N Boyle; C Fleming; S Coulter-Smith; Sh Khoo
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Publication Detail:
Type:  Journal Article     Date:  2010-08-18
Journal Detail:
Title:  HIV medicine     Volume:  12     ISSN:  1468-1293     ISO Abbreviation:  HIV Med.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100897392     Medline TA:  HIV Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  166-73     Citation Subset:  IM    
Copyright Information:
© 2010 British HIV Association.
The Rotunda Hospital, Dublin, Ireland The Catherine McAuley Research Centre, Mater Misericordiae University Hospital, Dublin, Ireland University College Dublin, Dublin, Ireland Department of Pharmacology, University of Liverpool, Liverpool, UK NIHR Biomedical Research Centre, Royal Liverpool Hospital Trust, Liverpool, UK University College Hospital Galway, Galway, Ireland.
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