The levels of azithromycin in the chorion tissue within the first 3 months of the pregnancy term (42 to 56 days post coitus) were determined. Three days after the use of azithromycin (Sumamed) the antibiotic concentration in the villi tissue was 0.065 to 0.26 mcg/mg (the average of 0.129 mcg/mg). The azithromycin concentration above 0.125 mcg/mg was detected in 38.5% of the women. The results confirmed the fact of significant azithromycin accumulation in the chorion tissue. The percentage of the azithromycin transplacental transfer within the above mentioned pregnancy term varied from 2.3 to 9.3 (the average of 4.6).
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