If symptoms persist after the initial epinephrine dose, what is the recommended action?

• A. Repeat 0.3 mg IM
• B. No further action
• C. Increase dose to 0.6 mg IM
• D. Switch to IV epinephrine

Answer: (A)

In anaphylaxis, epinephrine is the immediate therapy that reverses airway swelling, bronchospasm, and dangerous vasodilation. Its effects can fade, so if symptoms persist after the first intramuscular dose, the next best action is to administer another 0.3 mg IM dose after a short interval (about 5–15 minutes) if symptoms continue. This keeps the drug’s protective effects active while you monitor the patient and arrange further care.

Options like doing nothing would leave the patient untreated, increasing the risk of deterioration. Doubling the IM dose to 0.6 mg isn’t typical for a field-administered auto-injector, and switching to IV epinephrine is reserved for hospital settings under close supervision due to the higher risk of severe cardiovascular side effects.