Test microorganisms Diameter of zone of inhibition (mm)
  Kanamycin
30 µg/disc
Metformin
100 µg/disc
Cefepime
100 µg/disc
MC-1
100 µg/disc
MC-1
200 µg/disc
MC-1
300 µg/disc
Gram positive bacteria    
Bacillus cereus 35 - 22 14 14 20
Bacillus megaterium 35 - 30 15 17 18
Bacillus subtilis 37 - 32 15 21 26
Staphylococcus aureus 32 - 23 14 17 16
Sarcinalutea 34 - 28 18 22 24
Gram negative bacteria    
Escherichia coli 34 - 33 17 20 23
Pseudomonas aeruginosa 37 - 27 11 14 17
Shigellaboydii 38 - 27 18 22 27
Vibrio mimicus 37 - 26 13 15 19
Vibrio parahemolyticus 36 - 23 08 09 08
Fungi    
Aspergillus niger 35 - 28 18 19 23
Sacharomyces cerevacae 35 - 27 16 21 22
Table 1: Alterations in antimicrobial activity of Cefepime due to complexation with Metformin.