Both gentamycin and erythromycin belong to different kinds of antibacterial drugs, antibacterial spectrum is similar, gentamycin antibacterial effect is slightly stronger than erythromycin, adverse reactions are relatively more than erythromycin. Chrysomycin and erythromycin belong to different categories of antibiotics, erythromycin belongs to the macrolide class of drugs, chrysomycin belongs to the tetracycline class of drugs, the antibacterial spectrum of these two drugs is similar, on a variety of pathogens can achieve effective antibacterial efficacy. The antibacterial effect of aureomycin relative to erythromycin may be stronger, aureomycin adverse reactions than erythromycin a little more, so aureomycin is mainly used to make topical ointment, ointment, etc.; erythromycin in addition to making topical ointment, part of the erythromycin preparation can be orally, such as Erythromycin Athlette, Erythromycin Enteric Tablets, etc., which can be orally medicated.