What is the appropriate course of action for an adult patient showing signs of anaphylaxis?

The appropriate course of action for an adult patient showing signs of anaphylaxis is to administer epinephrine as per protocol. Anaphylaxis is a severe and potentially life-threatening allergic reaction that requires immediate intervention. Epinephrine works rapidly to reverse the symptoms by constricting blood vessels, increasing heart rate, and dilating airways, which can quickly alleviate airway swelling and restore normal circulation.

In the case of anaphylaxis, time is critical. The use of epinephrine can be the difference between life and death, making it the first-line treatment. Following the administration of epinephrine, monitoring the patient's vital signs and providing additional supportive care, such as oxygen supplementation, is also essential, but administering epinephrine is the priority.

Other options, such as giving an oral antihistamine or waiting for EMS, would not provide the immediate response needed for anaphylaxis. Oral antihistamines do not act quickly enough to counteract the severe reactions associated with anaphylaxis, and delaying treatment until EMS arrives could allow the patient's condition to deteriorate further.