Erythromycin is an antibiotic belonging to the macrolide class of antibiotics. It is a white to off-white, crystalline powder that is soluble in various organic solvents but only slightly soluble in water. Erythromycin is widely used in the medical field to treat a variety of bacterial infections.

As an antibiotic, erythromycin works by inhibiting the growth and reproduction of bacteria. It does so by binding to the bacterial ribosomes, thereby preventing the synthesis of essential proteins required for bacterial survival. Erythromycin is effective against a broad spectrum of bacteria, making it useful in treating respiratory tract infections, skin and soft tissue infections, ear infections, and more.

In addition to its medical applications, erythromycin is also used in the preparation of ophthalmic ointments for the treatment of eye infections. It is available in various forms, including oral tablets, capsules, topical solutions, and ointments.