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A population pharmacokinetic model for escitalopram and its major metabolite in depressive patients during the perinatal period: Prediction of infant drug exposure through breast milk
Author(s) -
Weisskopf Etienne,
Guidi Monia,
Fischer Céline J.,
Bickle Graz Myriam,
Beaufils Etienne,
Nguyen Kim An,
Morisod Harari Mathilde,
Rouiller Sylvie,
Rothenburger Sophie,
Gaucherand Pascal,
KassaiKoupai Behrouz,
Borradori Tolsa Cristina,
Epiney Manuella,
Tolsa JeanFrançois,
Vial Yvan,
Hascoët JeanMichel,
Claris Olivier,
Eap Chin B,
Panchaud Alice,
Csajka Chantal
Publication year - 2020
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/bcp.14278
Subject(s) - escitalopram , breast milk , medicine , breastfeeding , nonmem , population , breast feeding , pharmacokinetics , metabolite , citalopram , physiology , prospective cohort study , obstetrics , pediatrics , antidepressant , biology , environmental health , biochemistry , hippocampus
Background and objectives Escitalopram (SCIT) is frequently prescribed to breastfeeding women. Available information on SCIT excretion into breast milk is based on heterogeneous and incomplete data. A population pharmacokinetic model that aimed to better characterize maternal and infant exposure to SCIT and its metabolite was developed. Methods The study population was composed of women treated by SCIT or racemic citalopram and enrolled in the multicenter prospective cohort study SSRI‐Breast Milk study ( ClinicalTrial.gov NCT01796132). A joint structural model was first built for SCIT and S ‐desmethylcitalopram (SDCIT) in plasma using NONMEM and the milk‐to‐plasma ratio (MPR) was estimated by adding the drug breast milk concentrations. The effect of different influential covariates was tested and the average drug exposure with variability through breastfeeding was predicted under various conditions by simulation. Results The study enrolled 33 patients treated with SCIT or racemic citalopram who provided 80 blood and 104 milk samples. Mean MPR for both parent drug and metabolite was 1.9. Increased milk fat content was significantly associated with an increased drug transfer into breast milk (+28% for SCIT and +18% for SDCIT when fat amount doubles from 3.1 to 6.2 g/100 mL). Simulations suggested that an exclusively breastfed infant would ingest daily through breast milk 3.3% of the weight‐adjusted maternal SCIT dose on average. Conclusion The moderate between‐subject variability in milk concentration of SCIT and the limited exposure to escitalopram through breast milk observed provide reassurance for treated mothers of breastfed healthy infants.

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