E.E.S. 400 Liquid: Each 5-mL teaspoonful of orange-flavored suspension contains erythromycin ethylsuccinate equivalent to 400 mg of erythromycin. Granules and ready-made suspensions are. What Is Erythromycin Ethyl Succinate and How Does It Work? Erythromycin Ethyl Succinate is a prescription medication used for treating different types of bacterial infections. Erythromycin Ethyl Succinate is available under the following different brand names: E.E.S., EryPed. Erythromycin is easily inactivated by gastric acid; therefore, all orally administered formulations are given as either enteric-coated or more-stable salts or esters, such as erythromycin ethylsuccinate. 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 Ethylsuccinate reference guide for safe and effective use from the American Society of Health-System Pharmacists (AHFS DI). 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 E.E.S. (Erythromycin Ethylsuccinate) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Erythromycin ethylsuccinate is an ester of erythromycin suitable for oral administration. Erythromycin ethylsuccinate is known chemically as erythromycin 2'- (ethylsuccinate). Erythromycin ethylsuccinate tablets for oral administration are intended primarily for adults or older children. Erythromycin Ethyl Succinate Tablets package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. View erythromycin information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding, important safety information and directions for administration.