in an open prospective study of postoperative infectious complications , patients undergoing elective colorectal surgery were randomly allocated to one of three groups receiving parenteral single-dose antimicrobial prophylaxis ( 1 g or 3 g metronidazole or 1 g metronidazole + 3 g nalidixic acid ) .
C1136254
antimicrobial
C0025872
metronidazole