Please consult your physician before taking any medication. Generic Name: erythromycin (eer ith roe MYE sin) Brand Names: Spanish name, llosone, E-Mycin, E.E.S.-200, E.E.S.-400, Ery-Tab, Eryc, EryPed, Erythrocin Stearate Filmtab, Erythrocot, Ilosone, MY-E, PCE Dispertab, Robimycin What is erythromycin? Erythromycin is in a group of drugs called macrolide antibiotics. Erythromycin fights bacteria in the body. Erythromycin is used to treat many different types of infections caused by bacteria. Erythromycin may also be used for purposes other than those listed here.