How should epinephrine be administered for anaphylaxis in the EMS setting?

• A. Intramuscular injection (IM) in the mid-outer thigh, followed by rapid transport and monitoring.
• B. Oral tablet every 6 hours.
• C. Intravenous infusion over 30 minutes.
• D. Subcutaneous injection in the upper arm.

Answer: (A)

Rapid intramuscular epinephrine in the mid-outer thigh is the first-line approach for suspected anaphylaxis in the EMS setting because it provides the fastest, most reliable absorption to counter airway swelling, bronchoconstriction, and circulatory collapse. The thigh (vastus lateralis) is preferred for quick onset and easier administration with auto-injectors, which EMS can use quickly in the field. After giving the dose, immediate rapid transport with continuous monitoring is essential to manage ongoing symptoms and watch for biphasic reactions.

Oral tablets are not useful in an acute reaction due to slow onset. Subcutaneous injection has slower, less reliable absorption than intramuscular. Intravenous epinephrine is typically reserved for hospital settings under controlled conditions due to higher risk of adverse effects and the need for continuous monitoring.