Final answer:
Anaphylaxis is a very serious allergic reaction classified as immediate. It can cause life-threatening symptoms such as a drop in blood pressure, severe swelling of the throat, and airway blockage.
Step-by-step explanation:
Anaphylaxis is one very serious allergic reaction classified as immediate. It is a systemic type I hypersensitivity reaction that can be life-threatening. Anaphylaxis can cause a dangerous drop in blood pressure, severe swelling of the throat, and blockage of the airways, which can lead to shock and even death if not treated promptly with epinephrine injection.