Extract from the above information

No specific pharmacological effects mentioned

It belongs to the 14-membered macrolide antibiotics. It inhibits protein synthesis by blocking the association of the 50S subunit of the nucleoprotein and producing an antibacterial effect. It has a slightly better antibacterial effect on Gram-positive bacteria such as Streptococcus, Pneumococcus, and Staphylococcus than erythromycin, and also has certain antibacterial activity against induced erythromycin-resistant strains. Clarithromycin and its metabolites in the body enhance the antibacterial effect on influenza bacilli. It has a certain effect on gonococci, Listeria, and Campylobacter jejuni, and is stronger than erythromycin in the effect on Legionella pneumophila, Mycoplasma pneumoniae, Chlamydia trachomatis, and Ureaplasma urealyticum. In addition, it has a certain activity against Borrelia burgdorferi, Mycobacterium avium, and Toxoplasma gondii, and most of them are better than other varieties. In addition to having a strong antibacterial effect on anaerobic cocci, it is better than erythromycin in the effect on Bacteroides fragilis. The antibiotic after-effect on Staphylococcus aureus, Streptococcus pyogenes, and influenza bacilli is significantly stronger than erythromycin. Its antibacterial activity in vitro is similar to that of erythromycin, but its antibacterial activity in vivo against some bacteria such as Staphylococcus aureus, Streptococcus, Haemophilus influenzae, etc. is stronger than that of erythromycin. There is cross-resistance between it and erythromycin.