Erythrocin 500 Tablet is used to treat chest infections (pneumonia), skin conditions (acne and rosacea), dental abscesses (A pocket of pus in a tooth caused by an infection), and sexually transmitted infections. On the other hand, in children, it is generally used to treat ear or chest infections. It contains Erythromycin, which works by stopping the growth or killing harmful bacteria by preventing the production of proteins required by the bacteria for its survival. As a result, it effectively treats various bacterial infections. It may cause some common side effects such as diarrhoea, nausea, vomiting, and indigestion. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.