A nurse is caring for a client who has a prescription for amoxicillin. Which of the following findings should indicate to the nurse the client is experiencing an allergic reaction to the medication?

A. Laryngeal edema: Laryngeal edema is a serious sign of an allergic reaction, specifically anaphylaxis. It results from histamine-mediated swelling of the airway and can lead to respiratory obstruction, requiring immediate intervention and discontinuation of the medication. B. Diarrhea: Diarrhea is a common gastrointestinal side effect of many antibiotics, including amoxicillin, due to disruption of normal gut flora. While unpleasant, it is not an indicator of an allergic reaction unless accompanied by other hypersensitivity symptoms. C. Nausea: Nausea is another common side effect of amoxicillin but does not signify an allergic response. It often resolves with continued use or when the medication is taken with food, and does not necessitate discontinuation unless severe. D. Cardiac dysrhythmia: Cardiac dysrhythmias are not typical indicators of an allergic reaction to amoxicillin. While some severe allergic reactions can affect cardiovascular stability, laryngeal edema and urticaria are more classic signs of drug hypersensitivity.