title: [Sulfamethoxazole concentration in the homogenate of the human embryo].
abstract: The investigations on the extent of placental drug transfer has conventionally been based on determining drug concentration in cord blood at delivery. There is, however, data that levels in cord blood at delivery may provide misleading information on the extent of drug transfer in utero. It is due to the fact that not every drug reaches the fetus in pharmacologically active form. Hence, the evaluation of placental drug transfer requires determination of free drug concentration in fetal tissues. Seven women with indications for interruption of pregnancy for social reasons have taken Biseptol 480--Polfa (400 mg sulfamethoxazole and 80 mg trimethoprim) for 4-5 days before the operation. Each woman received 1,92 g of drug (4 tablets) a day in two divided doses. In the tissues obtained during abortion, the concentration of sulfamethoxazole was estimated by the modified method of Bratton and Marchall . The obtained results show that in the first trimester of gestation sulfamethoxazole crosses human placental barrier; it is detectable in embryo in a great amount. This fact indicates that administration of Biseptol to the pregnant mother may be harmful for the embryo. Our investigations have not permitted yet on for the statement that there is the correlation between the sulfamethoxazole concentration and week of gestation during the first trimester.
mesh_terms: D001692:Biological Transport; D004338:Drug Combinations / Q000008:administration & dosage; D004622:Embryo, Mammalian / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D013347:Subcellular Fractions / Q000378:metabolism*; D013420:Sulfamethoxazole / Q000008:administration & dosage / Q000378:metabolism*; D013997:Time Factors; D014295:Trimethoprim / Q000008:administration & dosage; D015662:Trimethoprim, Sulfamethoxazole Drug Combination
chemical_list: D004338:Drug Combinations; D015662:Trimethoprim, Sulfamethoxazole Drug Combination; D014295:Trimethoprim; D013420:Sulfamethoxazole
vernacular_title: Stezenie sulfametoksazolu w homogenacie ludzkiego jaja płodowego.