Erythromycin is an antibiotic medication that is classified as a macrolide. It is commonly prescribed to treat various bacterial infections caused by susceptible organisms. Erythromycin works by inhibiting the growth and reproduction of bacteria, helping to eradicate the infection.

The active ingredient in erythromycin is erythromycin itself. It is available in different forms, such as oral tablets, capsules, liquid suspensions, ointments, and eye ointments. Each formulation is specifically formulated to target different types of infections and can be administered through various routes.

Erythromycin demonstrates efficacy against a broad spectrum of bacteria, including both Gram-positive and some Gram-negative bacteria. It is often utilized for respiratory tract infections, skin and soft tissue infections, sexually transmitted infections, and specific gastrointestinal infections.