Work presented herein is the first report of two dual-action hybrids synthesized by covalent linkage of carbazole based novel\nantibacterial compounds with efflux pump inhibitors, that is, indole acetic acid/gallic acid. In this paper, novel antibacterial\ncompounds 2 and 3 were prepared first and then these were covalently linked with efflux pump inhibitors, that is, indole acetic\nacid/gallic acid leading to the successful formation of two dual-action hybrids 4 and 5. Prepared antibacterials and hybrids were\nevaluated for their bacteria cell killing capability against Escherichia coli, Staphylococcus aureus, Pasteurella multocida, and Bacillus\nsubtilis. Both antibacterial compounds 2 and 3 were found effective against all tested bacterial strains at different concentrations.\nBut when these compounds were linked with efflux pump inhibitors, they showed dramatic enhancement in their bacterial cell\nkilling potential and minimum inhibitory concentration of all hybrids ranging from 7.250
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