Clarithromycin is a semi-synthetic macrolide antibiotic that is used in the treatment of pharyngitis, tonsillitis, acute maxillary sinusitis, acute bacterial exacerbation of chronic bronchitis, atypical pneumonias associated with Chlamydia pneumoniae, skin and skin structure infections, and, in HIV and AIDS patients to prevent, and to treat, disseminated Mycobacterium avium complex. In addition, it is also used to treat Legionellosis and lyme disease.
Clarithromycin is available under several brand names such as Biaxin and Klaricid. Chemically, it is 6- 0-methylerythromycin. The molecular formula is C38H69NO13, and the molecular weight is 747.96.