Erythromycin is a broad-spectrum macrolide antibiotic. It is prescribed to treat a wide variety of infections caused by bacteria including infections of upper and lower respiratory tract (e.g., tonsillitis, laryngitis, bronchitis, pneumonia), skin and tissue infections (cellulitis, impetigo), eye and ear infections (blepharitis, otitis media), sexually-transmitted infections (gonorrhea, syphilis), and others. Its is also used to prevent infections following trauma, surgery, and burns.

Erythromycin acts by inhibiting protein synthesis and preventing bacteria growth. Remaining bacteria die or are destroyed by the immune system. With its action similar to that of penicillin antibiotics, Erythromycin can be an alternative for people who are allergic to penicillins. Erythromycin comes in a variety of formats: tablets, capsules, suspension, suppositories, and powder for injections. Doctor prescribes Erythromycin dosage depending on the particular infection. It may produce side effects.