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Pharmacokinetics of clindamycin hydrochloride in pregnant women

Number of visits:1000 Date:2016/1/7 7:37:42
Pharmacokinetics of clindamycin hydrochloride in pregnant women in the peripartum period.

The study presented here was performed to determine the pharmacokinetics of intravenously administered clindamycin hydrochloride in pregnant women. Seven pregnant women treated with clindamycin hydrochloride were recruited. Maternal blood and arterial and venous umbilical cord blood samples were obtained. Maternal clindamycin hydrochloride concentrations were analyzed by nonlinear mixed-effects modeling with the NONMEM program. The data were best described by a linear three-compartment model. The clearance and the volume of distribution at steady state were 10.0 liters/h and 6.32 x 10(3) liters, respectively. Monte Carlo simulations were performed to determine the area under the concentration curve (AUC) for the free (unbound) drug (f) in maternal serum for 24 h divided by the MIC (fAUC(0-24)/MIC). At a MIC of 0.5 mg/liter, which is the EUCAST breakpoint, the attainment at the lower 95% confidence interval (CI) was 24.6 if the level of protein binding was 65%, and this value concurred well with the target value of 27. However, for higher degrees of protein binding, as has been described in the literature, the attainment was lower, down to 10.2 for a protein binding level of 85% (lower 95% CI). The concentrations in umbilical cord blood were lower than those in maternal blood. The concentration-time profiles in maternal serum indicate that the level of exposure to clindamycin hydrochloride may be too low in these patients. Together with the lower concentrations in umbilical cord blood, this finding suggests that the current dosing regimen may not be adequate to protect all neonates from group B streptococcal disease.
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