What is the most common side effect of erythromycin?

Erythromycin, an antibiotic used to treat various bacterial infections, is known for its gastrointestinal side effects. The most common side effect experienced by patients taking erythromycin is nausea and vomiting. This occurs due to the drug's effect on the gastrointestinal tract; it stimulates motility of the stomach and intestines, which can lead to discomfort and nausea.

Patients often report these symptoms when they start treatment with erythromycin, and these side effects may be significant enough to affect adherence to the prescribed regimen. Understanding this common side effect can help healthcare providers counsel patients effectively, allowing for a better managed overall treatment experience.