This disclosure provides a method of potentiating the efficacy of certain antibiotics by administering a therapeutically effect amount of the antibiotic in combination with SPR741. In certain embodiments the antibiotic is retapamulin, telithromycin, or aztreonam. The disclosure also provides a method of treating a bacterial infection by administering SPR741 in combination with a second antibiotic and pharmaceutical compositions comprising SPR741 and a second antibiotic.