Purpose. To study the pharmacokinetics of -lactam antibiotics in the development of endometritis after cesarean section to select the optimal dosage regimen. Methods. A prospective, randomized, single-center study included 52 women in puerperas with endometritis after a caesarean section, divided into four groups. The patients of the first group (n = 17) received a course of ceftriaxone bolus in a single dose of 2.0 g (n = 10) and in the mode of prolonged perioperative infusion (n = 7). The patients of the second group (n = 10) received cefepim bolus at a dose of 2.0 g 2 times a day (n = 5) and in the extended infusion mode (n = 5). The patients of the third group (n = 14) received amoxicillin / clavulanic acid (Amoxiclav 1000 mg + 200 mg) bolus at a dose of 1.0 g 3 times a day (n = 7) and in the extended infusion regimen (n = 7). The patients of the fourth group (n = 11) received ampicillin / sulbactam (Ampisid 1000 mg + 500 mg) bolus at a dose of 1.0 g 4 times a day (n = 6) and in the extended infusion regimen (n = 5). We have compared the concentration of the studied antibiotics in the uterine cavity in the four groups using high performance liquid chromatography. Results. The effective bactericidal concentration (C 4MIC) was not maintained throughout the entire dose interval in any of the treatment groups. The clinical efficacy and safety of the studied antibiotic regimens were similar. However, prolonged infusion of cefepime and aminopenicillins provided significantly higher concentrations in lochia. Conclusion. Prolonged intravenous infusion of cefepime, ceftriaxone, amoxicillin / clavulanic acid and ampicillin / sulbactam in the treatment of endometritis after a caesarean section improves the pharmacokinetic / pharmacodynamic characteristics of these -lactams in the uterine cavity, compared with the traditional bolus administration.

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