A nurse is caring for a client who is taking oral erythromycin. Which of the following statements by the nurse indicates the client is experiencing a common adverse effect of this medication?

A. Tinnitus, or ringing in the ears, is a common adverse effect of aminoglycosides such as gentamycin which cause ototoxicity, rather than erythromycin which is a macrolide. B. Constipation with abdominal cramping, is not a commonly reported side effect of erythromycin; this medication is more likely to cause diarrhea rather than constipation. C. Common adverse effects of oral erythromycin include gastrointestinal symptoms such as abdominal cramping and nausea. Therefore, the statement indicating the client is experiencing a common adverse effect would be having a small amount of yellow emesis which aligns with the reported side effects of nausea and vomiting. D. Swollen lips are not a common adverse effect of erythromycin. This symptom may indicate an allergic reaction or another issue unrelated to the medication.