This product is a semi-synthetic 14-membered macrolide antibiotic. Its antibacterial spectrum and antibacterial effect are basically similar to those of erythromycin. Its effect on Gram-positive bacteria is slightly worse than that of erythromycin, and its effect on Legionella pneumophila is stronger than that of erythromycin. Its antimicrobial effect on Chlamydia pneumoniae, Mycoplasma pneumoniae, and Ureaplasma urealyticum is similar to or slightly stronger than that of erythromycin. This product can penetrate the bacterial cell membrane and reversibly bind to the 50S subunit of the bacterial ribosome near the donor (P position), blocking the transfer RNA (t-RNA) from binding to the P position, and also blocking the transfer of the polypeptide chain from the acceptor position (A position) to the P position, thereby inhibiting bacterial protein synthesis.

It acts on dihydrofolate synthase, interfering with the first step of folic acid synthesis. When used in combination with trimethoprim, it can double block bacterial folic acid metabolism and enhance the synergistic antibacterial effect. It has good antibacterial effects on non-enzyme-producing Staphylococcus aureus, Streptococcus pyogenes, Streptococcus pneumoniae, Escherichia coli, Klebsiella, etc.

It acts on the second step of folic acid anabolism, selectively inhibits the action of dihydrofolate reductase, and can double block bacterial folic acid metabolism when used in combination with sulfamethoxazole, enhancing the synergistic antibacterial effect. It has good antibacterial effects on non-enzyme-producing Staphylococcus aureus, Streptococcus pyogenes, Streptococcus pneumoniae, Escherichia coli, Klebsiella, etc.