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The clinical development programme for cefmetazole sodium included over 4000 patients treated by 78 investigators. Cefmetazole therapy was compared with that of cefoxitin sodium (cefoxitin) for the treatment of urinary tract, skin and soft tissue, lower respiratory, abdominal, and gynaecological infections (with cefoxitin-sensitive pathogens) and for the prevention of postoperative wound infection in patients undergoing surgical procedures. Both cefmetazole and cefoxitin were administered intravenously in all studies. Cefmetazole was as effective as cefoxitin in the treatment of the infections studied. In the surgical wound infection prophylaxis studies, multiple-dose cefmetazole therapy was more effective than multiple-dose cefoxitin therapy in patients undergoing lower gastrointestinal surgery; this difference approached statistical significance. Both multiple-dose and single-dose cefmetazole therapy were as effective as multiple-dose cefoxitin treatment in the other types of surgery studied. Clinical laboratory findings and adverse medical events reported among cefmetazole patients were similar to those observed in patients treated with cefoxitin.