MedlinePlus lists no interaction between erythromycin and alcohol. It is best to take erythromycin one hour before or two hours after meals and to avoid taking erythromycin with fruit juices and carbonated beverages.
According to MedlinePlus, erythromycin is an antibiotic that is used to treat bacterial infections, such as bronchitis, diphtheria, Legionnaires' disease, pertussis, pneumonia, rheumatic fever, venereal disease and infections involving the ears, intestines, lungs, urinary tract and skin. It is also used to prevent infection prior to certain dental or surgical procedures. Potential side effects of erythromycin include vomiting, diarrhea, stomach cramps and mild skin rash. MedlinePlus recommends reporting these side effects to a doctor if they are severe or unrelieved.