A client with a history of anaphylactic reaction to penicillin receives a prescription for cephalexin 500 mg PO twice daily. Which action should the nurse take?

A. Administering cephalexin without assessing for potential cross-reactivity to penicillin could put the client at risk of an allergic reaction. B. Cephalexin, a cephalosporin, may cause allergic reactions, especially in those with a penicillin allergy. Therefore, monitoring for symptoms such as rash or hives is crucial. C. While it is important to monitor for adverse reactions, contacting the healthcare provider might be unnecessary unless the client shows symptoms of an allergic reaction. D. Antihistamines are not routinely administered with cephalexin unless prescribed specifically for managing allergic reactions.