What should a nurse do for a client who received penicillin and is experiencing anxiety, flushing, tachycardia, and difficulty swallowing?

In this scenario, the client is exhibiting symptoms that suggest a possible anaphylactic reaction, including anxiety, flushing, tachycardia, and difficulty swallowing. Administering oxygen is crucial in this situation as it addresses potential airway compromise and hypoxia, which can occur during an allergic reaction. Ensuring that the client has adequate oxygenation is a priority, as compromised airway or breathing can lead to severe complications.

While other actions, such as reassessing and monitoring vital signs, administering antihistamines, or notifying a physician, are important components of care, they do not directly address the immediate physiological needs of the client who may be in distress due to anaphylaxis. Administering oxygen provides critical support and should be done promptly to stabilize the client while other interventions are initiated.