What is the typical route for epinephrine administration in anaphylaxis when an auto-injector is not available?

• A. Intramuscular injection into the mid-outer thigh.
• B. Intravenous bolus.
• C. Subcutaneous in the upper arm.
• D. Inhaled through a nebulizer.

Answer: (B)

Prompt intramuscular epinephrine into the mid-outer thigh is the recommended route for anaphylaxis when no auto-injector is available. This route provides rapid, reliable absorption into the systemic circulation, which is essential to quickly counteract airway swelling, bronchospasm, and hypotension. The thigh muscle offers good perfusion and is easy to access, making the onset faster and more predictable than other approaches.

Intravenous epinephrine is reserved for hospital settings with careful monitoring because it carries a higher risk of severe cardiovascular effects if dosed incorrectly. Subcutaneous administration tends to absorb more slowly and variably, which is less reliable in a life-threatening reaction. Inhaled epinephrine does not adequately address systemic symptoms and is not appropriate for full-body anaphylaxis.

So, the best route in this situation is an intramuscular injection into the mid-outer thigh.