The aim of this presentation is to study the advantages and disadvantages of perioperative prophylaxis with the antibiotic Mefoxin against the classical postoperative antibiotic prophylaxis with penicillin and gentamicine, as well as to analyse the place of this antibiotic in modern treatment of different forms of pelvic inflammatory disease. The authors conclude that the qualities of Mefoxin (high resistant wide spectrum antibiotic, covering aerobes and anaerobes), make it an ideal antibiotic for perioperative prophylaxis in gynaecologic and oncologic surgery; the clinical effectiveness of Mefoxin in the treatment of inflammatory diseases of the female pelvis precludes the need for a combined parenteral antibiotic therapy.