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coli (from 256 to 2 mg/L, fractional inhibitory concentration index (FICI)≤0.02) and by a factor of at least 64 in K. pneumoniae (from 1024 mg/L to 16 mg/L, FICI≤0.05). Synergy between PMBN and PBA enhanced ceftazidime activity 133 times in P. aeruginosa (from 16 mg/L to 0.12 mg/L, FICI≤0.03). As a consequence, MICs of all the antibiotics tested were brought down to therapeutic range. In addition, the combinations also reduced several orders of magnitude the amount of inhibitor needed for antibiotic sensitization. Ceftazidime/PBA/PMBN a