Table 1 Ursolic acid exhibits synergy with colistin against most of the strains of Escherichia coli and Klebsiella pneumoniae
From: Ursolic acid inhibits colistin efflux and curtails colistin resistant Enterobacteriaceae
|  | Col + UR | Col + AS | ||
|---|---|---|---|---|
FIC index | Effect | FIC index | Effect | |
E. coli | ||||
 U3790 | 0.19 | Synergy | 0.07 | Synergy |
 U3176 | 0.19 | Synergy | 0.37 | Synergy |
K. pneumoniae | ||||
 BC936 | 0.06 | Synergy | 0.06 | Synergy |
 U2016 | 0.50 | Synergy | 0.25 | Synergy |
 BC1415 | 1.06 | Additive | 1.03 | Additive |
 BC1994 | 0.38 | Synergy | 0.62 | Additive |
 MTCC K. pneumoniae | 0.38 | Synergy | 1.25 | Additive |
 BC2412 | 0.38 | Synergy | 1.25 | Additive |
 U3866 | 0.25 | Synergy | 1 | Additive |