Possible Side Effects of Erythromycin

Side effects of erythromycin can include gastrointestinal problems and allergies. Liver problems can occur, especially in patients with preexisting liver disorders. Some cases of dangerous heart irregularities have also been reported. Erythromycin should not be taken with terfenadine, astemisole or cisapride, as these combinations can greatly increase the possibility of heart irregularities. Nausea, vomiting, gastric pain, and abdominal cramps are also known side effects.