A nurse is preparing to administer erythromycin PO to a client who has an infection. The nurse checks the client's medical record and notes that the client has a severe allergy to penicillin. Which of the following actions should the nurse take?

A. Premedicate the client with diphenhydramine. Premedicating with diphenhydramine is not necessary unless the client has a history of mild allergic reactions to erythromycin. Erythromycin is a macrolide antibiotic and does not have significant cross-reactivity with penicillin, making premedication unnecessary. B. Request a different route of administration from the provider. Changing the route of administration does not address concerns about allergy. Erythromycin is well tolerated in clients with a penicillin allergy, and there is no indication that a different route would be required unless the client has difficulty swallowing or gastrointestinal intolerance. C. Administer the medication to the client. Erythromycin belongs to the macrolide class and is commonly prescribed as an alternative for clients allergic to penicillin. There is no cross-reactivity between macrolides and penicillins, making erythromycin a safe and effective option for treating bacterial infections in these clients. D. Request a different medication from the provider. There is no need to request an alternative medication unless the client has a known allergy to erythromycin. Since macrolides are safe for clients with penicillin allergies, withholding the medication without a valid reason could delay necessary treatment.