It is a broad-spectrum antibiotic, its antibacterial spectrum and antibacterial principle is basically the same with tetracycline.
It mainly has antibacterial activity to Gram-positive bacteria, meningococcal, and gram-negative bacteria such as Micrococcus gonococcus.
It has a strong bactericidal effect to Gram-positive bacteria such as Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Salmonella, Serratia, Neisseria gonorrhoeae, etc