Erythromycin Ethylsuccinate Oral Solution 200 mg per 5 mL, 100 mLErythromycin ethylsuccinate is an antibiotic used to treat a variety of bacterial infections. It works by inhibiting the growth of bacteria. Common uses include treating respiratory tract infections, skin infections, ear infections, and certain sexually transmitted infections. It may also be prescribed for other types of infections as determined by a healthcare provider. As with all antibiotics, it's important to complete the full course of treatment