Document Detail

Transplacental exchange of moxidectin after maternal or fetal intravenous administration in sheep.
MedLine Citation:
PMID:  20444015     Owner:  NLM     Status:  MEDLINE    
The transplacental exchange of moxidectin after maternal or fetal intravenous (i.v.) administration was studied using the chronically catheterized fetal sheep model. Nine pregnant Suffolk Down sheep of 65.7 +/- 5.9 kg body weight (bw) were surgically prepared to insert polyvinyl catheters in the fetal femoral artery and vein and amniotic sac. The ewes were randomly assigned to two experimental groups. In group 1 (maternal injection) five ewes were treated with an i.v. bolus of 0.2 mg of moxidectin/kg bw. In group 2, (fetal injection) an i.v. bolus of 1 mg of moxidectin was administered to the four fetuses by femoral vein catheters. Maternal and fetal blood and amniotic fluid samples were taken before and after moxidectin administration for a 144 h post-treatment period. Samples were analyzed by liquid chromatography. A noncompartmental pharmacokinetic analysis was performed and statistical differences were determined by mean of parametric and nonparametric statistical tests. Pharmacokinetic differences observed in maternal variables were shorter elimination half-life and mean residence time compared with values previously reported for ivermectin. Drug diffusion from maternal to fetal circulation (AUC(0-t) = 232.6 +/- 72.5 ng.h/mL) was statistically not different (P = 0.09) compared with fetal to maternal diffusion (AUC(0-t) = 158.0 +/- 21.6 ng.h/mL). Fetuses showed significantly (P = 0.008) lower drug body clearance values compared with those observed in the maternal side. Considering the observed transplacental passages between materno-fetal or feto-maternal circulations, we conclude that the placental barrier is not effective in preventing the moxidectin diffusion between mother and fetus.
R Pérez; C Palma; M J Núñez; M Navas; G Olmos; J Cox
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of veterinary pharmacology and therapeutics     Volume:  32     ISSN:  1365-2885     ISO Abbreviation:  J. Vet. Pharmacol. Ther.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-05-06     Completed Date:  2010-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7910920     Medline TA:  J Vet Pharmacol Ther     Country:  England    
Other Details:
Languages:  eng     Pagination:  596-605     Citation Subset:  IM    
Laboratorio de Farmacología, Departamento de Ciencias Clínicas, Facultad de Ciencias Veterinarias, Universidad de Concepción, Chillán, Chile.
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MeSH Terms
Area Under Curve
Fetal Blood
Injections, Intravenous
Insecticides / blood,  pharmacokinetics*
Macrolides / blood,  pharmacokinetics
Maternal-Fetal Exchange
Metabolic Clearance Rate
Pregnancy, Animal*
Reg. No./Substance:
0/Insecticides; 0/Macrolides; 51570-36-6/milbemycin

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