The practical nurse (PN) notes that a home health client who is taking a fluoroquinolone to treat a respiratory infection is sitting on an uncovered, outdoor porch. Which action should the PN take?

Choice A reason: Cephalexin, a cephalosporin, has a 5–10% cross-reactivity risk with penicillin allergies due to similar beta-lactam structures. An anaphylactic history increases the risk of severe reactions. Contacting the provider ensures safety, potentially leading to an alternative antibiotic to prevent life-threatening allergic responses.

Choice B reason: Monitoring for rash or hives is reactive and insufficient for a client with a penicillin anaphylaxis history. Cephalexin’s cross-reactivity risk requires proactive avoidance, not just observation, as anaphylaxis can occur rapidly, making this choice inadequate compared to provider consultation.

Choice C reason: Giving cephalexin with an antihistamine does not prevent anaphylaxis, which can be rapid and severe in penicillin-allergic clients. Antihistamines mitigate mild allergies but are ineffective against severe reactions. This choice is unsafe without confirming the drug’s appropriateness first.

Choice D reason: Administering cephalexin as prescribed ignores the significant risk of cross-reactivity with penicillin, given the client’s anaphylactic history. This could trigger a life-threatening reaction, as cephalosporins share structural similarities with penicillins, making immediate administration without verification dangerous.

Choice A reason: Gum appearance is unrelated to carbamazepine’s side effects or sore throat. While some antiseizure drugs cause gingival hyperplasia, carbamazepine does not, and gum assessment does not clarify the sore throat’s cause, which may indicate infection or agranulocytosis, making this choice irrelevant.

Choice B reason: Bowel sounds assess gastrointestinal function, not relevant to a sore throat or carbamazepine’s effects. Sore throat may signal agranulocytosis, a rare side effect, but bowel sounds do not provide data on infection or hematologic issues, making this choice inappropriate.

Choice C reason: Carotid pulse volume evaluates cardiovascular status but is unrelated to sore throat or carbamazepine’s side effects. Sore throat may indicate infection or agranulocytosis, requiring systemic assessment like temperature, not vascular checks, making this choice irrelevant for the reported symptom.

Choice D reason: Temperature is critical, as sore throat may indicate infection or agranulocytosis, a rare but serious carbamazepine side effect causing low white blood cells. Fever suggests infection, necessitating urgent reporting. This assessment provides key data to differentiate causes, guiding timely intervention.