Table 1.
Recommended fractional inhibitory concentration (∑FIC) indices for assigning combination effects
| Combination effect | ∑FIC range |
|---|---|
| Synergy | ∑FIC ≤ 0.5 |
| Additivity | 0.5 < ∑FIC ≤ 1.0 |
| Indifference | 1.0 < ∑FIC ≤ 4.0 |
| Antagonism | 4.0 < ∑FIC |
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