Synergy and antagonism with fluoroquinolone combination therapy
| Organism | Combination | Antagonism (%) | Indifferent (%) | Additive (%) | Synergy (%) |
| Staphylococcus aureus | Meropenem+ciprofloxacin | 0 | 20 | 70 | 10 |
| Meropenem+moxifloxacin | 0 | 60 | 40 | 0 | |
| Moxifloxacin + teicoplanin | 0 | 40 | 60 | 0 | |
| Ciprofloxacin + teicoplanin | 0 | 40 | 50 | 10 | |
| Pseudomonas aeruginosa | Meropenem+ciprofloxacin | 0 | 10 | 80 | 10 |
| Meropenem+moxifloxacin | 0 | 50 | 30 | 20 | |
| Gentamicin +ciprofloxacin | 10 | 13 | 6 | 0 | |
| Gentamicin +moxifloxacin | 0 | 80 | 0 | 20 |
In vitro results of a fluoroquinolone combined with a second antimicrobial against bacterial keratitis isolates. percentage of activity represents the percentage of isolates against which the respective antimicrobial combination provides a fractional inhibitory concentration that indicates an additive, indifferent, antagonistic or synergistic response.105