Colistin is active against most strains of gram negative bacteria including P. aeruginosa, E. coli, K. pneumoniae, Aerobacter.

• 多粘菌素是最积极反对株革兰氏阴性菌包括绿脓杆菌，大肠杆菌，肺炎克雷伯菌 ， 产气。