Overview: Erythromycin is an antibiotic that is used to treat or prevent infections caused by certain bacteria. Common side effects include nausea, stomach pain, diarrhea, and loss of appetite. Erythromycin is used to treat certain infection caused by bacteria including infections of the ears, lungs, sinuses, skin, throat, and reproductive organs. Erythromycin is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria. Erythromycin reference guide for safe and effective use from the American Society of Health-System Pharmacists (AHFS DI). Erythromycin is used to treat: It is used for the treatment of staphylococcal infections of the skin and as an alternative antibiotic for the treatment of syphilis, gonorrhea, and chlamydia. Complete prescribing information for all erythromycin formulations — oral, intravenous, topical, and ophthalmic — with adult and pediatric dosing tables and administration guidance. Erythromycin is used to prevent and treat infections in many different parts of the body, including respiratory tract infections, skin infections, diphtheria, intestinal amebiasis, acute pelvic inflammatory disease, Legionnaire's disease, pertussis, and syphilis. Erythromycin is a macrolide antibiotic used to treat bacterial infections. Includes erythromycin side effects, interactions and indications. Erythromycin is an antibiotic that's used to treat a variety of infections caused by bacteria, including certain skin and respiratory infections. The dosage depends on the specific infection you're using it for. Erythromycin (sometimes abbreviated ETM in reports) [3] is an antibiotic used for the treatment of a number of bacterial infections. [1] This includes respiratory tract infections, skin infections, chlamydia infections, pelvic inflammatory disease, and syphilis. [1] Find out how erythromycin treats chest and skin infections, ear infections and sexually transmitted infections (STIs), and how to take it. NHS medicines information on erythromycin – what it's used for, side effects, dosage and who can take it.