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Eur J Clin Pharmacol. 1980 Oct;18(3):245-7.

The placental transfer of betamethasone.


The plasma concentrations of betamethasone in a maternal peripheral vein (mv) and in the umbilical vein (uv) were measured at delivery in eleven patients after the administration of betamethasone phosphate equivalent to 8 mg betamethasone. Betamethasone concentrations were measured in plasma using a specific and sensitive HPLC assay. The time interval between the last dose and delivery ranged from 56 min to 800 min and over this time period the mean plasma concentration ratio Cuv/Cmv was 0.28 +/- 0.04 (SD) and exhibited no time dependence.

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