Moderate to severe allergic reaction requires epinephrine; when should it be given?

Moderate to severe allergic reaction requires epinephrine; when should it be given?

• A. Epinephrine for any reaction
• B. Epinephrine only if wheezing
• C. Moderate/severe reaction
• D. Never give epinephrine

Answer: (C)

The main concept here is that epinephrine is the first-line treatment when a patient has a moderate to severe allergic reaction to prevent progression to life-threatening anaphylaxis. In these reactions, airway swelling, bronchospasm, and dropping blood pressure can develop quickly. Epinephrine acts fast to reverse these problems by constricting blood vessels, reducing mucosal swelling, and opening the airways, which helps prevent airway compromise and shock. Mild reactions that only involve hives or itching without airway or perfusion involvement may not require epinephrine, and wheezing alone does not define every dangerous reaction—anaphylaxis can occur with other symptoms as well. Therefore the indication is moderate to severe reactions with significant airway, breathing, or circulatory symptoms, not every allergic reaction. In the field, administer intramuscularly into the mid-thigh as soon as a moderate-to-severe reaction is recognized, using an auto-injector if available or per local dosing guidelines (adult about 0.3 mg; pediatric dosing based on weight up to 0.3 mg), with repeat doses every 5–15 minutes as needed under medical direction.

The main concept here is that epinephrine is the first-line treatment when a patient has a moderate to severe allergic reaction to prevent progression to life-threatening anaphylaxis. In these reactions, airway swelling, bronchospasm, and dropping blood pressure can develop quickly. Epinephrine acts fast to reverse these problems by constricting blood vessels, reducing mucosal swelling, and opening the airways, which helps prevent airway compromise and shock. Mild reactions that only involve hives or itching without airway or perfusion involvement may not require epinephrine, and wheezing alone does not define every dangerous reaction—anaphylaxis can occur with other symptoms as well. Therefore the indication is moderate to severe reactions with significant airway, breathing, or circulatory symptoms, not every allergic reaction. In the field, administer intramuscularly into the mid-thigh as soon as a moderate-to-severe reaction is recognized, using an auto-injector if available or per local dosing guidelines (adult about 0.3 mg; pediatric dosing based on weight up to 0.3 mg), with repeat doses every 5–15 minutes as needed under medical direction.