Pexiganan is composed of 22 amino acids. In clinical manifestations, it has the advantages of low possibility of inducing drug resistance and no cross-resistance of existing therapeutic antibiotics. Pexiganan is a kind of cationic peptide with a strong antibacterial effect, with the characteristics of small molecular weight, rapid synthesis, rapid diffusion, strong alkalinity, high thermal stability, good water solubility, and unique antibacterial mechanism. Pexiganan has the broad-spectrum antibacterial ability, and it can kill viruses and tumor cells. More importantly, Pexiganan has no obvious toxic effect on normal cells of higher animals.