A client is brought into the emergency department after finishing a course of antibiotics for a urinary tract infection. The client is experiencing dyspnea, chest tightness, and agitation. Her blood pressure is 88/58, she has generalized hives over her body, and her lips and tongue are swollen. After the nurse calls for help, what is the next appropriate action?

A client experiencing an anaphylactic reaction will likely present with rash or hives, swelling of the lips, face, or tongue, hypotension, or dyspnea. In this scenario, the client is showing signs of anaphylaxis with dyspnea, chest tightness, hives, hypotension, and swelling of the lips and tongue. The next appropriate action would be to administer 0.3 mg of 1:1000 epinephrine intramuscularly. Epinephrine helps relax the muscles of the airway, improve breathing, and increase oxygenation, which is crucial in managing anaphylaxis. Starting an IV and administering fluids can be important but not the immediate priority. Diphenhydramine may be used as an adjunct therapy but should not delay the administration of epinephrine in the acute phase of anaphylaxis. Monitoring the client without providing immediate treatment can lead to a worsening of the anaphylactic reaction, potentially resulting in a life-threatening situation.