Erythromycin may cause diarrhea, and in some cases it can be severe. It may occur 2 months or more after you stop using this medicine. Do not take any medicine to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer. Erythromycin is an antibiotic for bacterial infections. It has many drug interactions, including with Viagra, statins, and more. Here are nine interactions to know. The most frequent side effects of erythromycin are nausea, vomiting, loss of appetite, diarrhea, and abdominal pain. Consult with your doctor about any medications or supplements you may be taking and if there is potential for drug interactions with erythromycin. Erythromycin injection is used to treat bacterial infections in many different parts of the body. It is also used to treat diphtheria, acute pelvic inflammatory disease, and Legionnaire's disease. Learn about the side effects of erythromycin, from common to rare, for consumers and healthcare professionals. Erythromycin is a macrolide antibiotic used to treat bacterial infections. Includes erythromycin side effects, interactions and indications. Learn about the side effects of erythromycin, a macrolide antibiotic. We’ll talk about common, rare, and long-term reactions, and how to manage them. Find patient medical information for Erythromycin (E.E.S., E-Mycin, and others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Erythromycin is in a class of medications called macrolide antibiotics. It works by stopping the growth of bacteria. Antibiotics such as erythromycin will not work for colds, flu, or other viral infections. Taking antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment. Due to the high concentration in phagocytes, erythromycin is actively transported to the site of infection, where, during active phagocytosis, large concentrations of erythromycin are released.