What is the first-line treatment for an anaphylactic reaction?

• A. Epinephrine administration
• B. Antihistamines
• C. Corticosteroids
• D. Oxygen therapy

Answer: (A)

Immediate epinephrine administration is the first-line treatment for anaphylaxis because it rapidly reverses the life-threatening airway, breathing, and circulation problems that define the reaction. Epinephrine works on multiple receptor types to produce a quick, broad effect: alpha-1-driven vasoconstriction reduces swelling and helps raise blood pressure; beta-1 stimulation supports heart output; and beta-2 activation causes bronchodilation and reduces the release of allergic mediators from mast cells. This combination can halt progression to airway obstruction and shock, buying crucial time for further care. The typical approach is an intramuscular injection into the mid-outer thigh, with a dose of about 0.3–0.5 mg for adults and 0.01 mg/kg (up to 0.3 mg) for children, with a second dose if symptoms persist after several minutes. After giving epinephrine, seek emergency medical help and provide supportive care as needed. Antihistamines and corticosteroids may help with later symptoms but do not act quickly enough to treat the acute crisis, and oxygen supports breathing without addressing the underlying reaction. The key point is that stopping the reaction promptly hinges on administering epinephrine first.