Anaphylaxis Management with Epinephrine

Adult Dosing

The American Heart Association recommends that adults receive 0.3 to 0.5 mg of epinephrine (1:1000 concentration) administered intramuscularly into the anterolateral aspect of the thigh, repeated every 5 to 15 minutes as needed 1
Repeat doses can be administered every 5 to 15 minutes as needed based on patient response, with approximately 6-19% of patients requiring a second dose of epinephrine 1, 2

For children weighing <30 kg (66 lbs), the recommended dose is 0.01 mg/kg (0.01 mL/kg of 1:1000 concentration) up to a maximum of 0.3 mg intramuscularly, although specific autoinjector doses are recommended for different weight ranges 3

The American Academy of Pediatrics and the American Heart Association recommend intramuscular (IM) injection into the anterolateral thigh (vastus lateralis muscle) as the preferred route for first-line treatment, producing rapid peak plasma concentrations compared to subcutaneous administration 1, 2
Intravenous (IV) epinephrine should be reserved for patients in anaphylactic shock when an IV line is already in place or for cardiac arrest or profound hypotension unresponsive to IM epinephrine and fluid resuscitation 1, 3

The American Academy of Allergy, Asthma, and Immunology states that there are no absolute contraindications to epinephrine use in anaphylaxis, even in elderly patients with comorbidities, with common adverse effects including transient pallor, tremor, anxiety, and palpitations 2, 4
For patients requiring continuous treatment, consider adding 1 mg (1 mL of 1:1000) epinephrine to 1000 mL of 0.9% normal saline, starting at 2 μg/min (2 mL/min or 120 mL/h) and titrating up to 10 μg/min (10 mL/min or 600 mL/h) according to blood pressure, cardiac rate, and oxygenation 4

Withholding epinephrine due to fear of adverse effects is not recommended, as the benefits far outweigh the risks in anaphylaxis, according to the American Academy of Allergy, Asthma, and Immunology and the American Academy of Pediatrics 2, 4

For any patient experiencing anaphylaxis, give an immediate IM injection of epinephrine 0.01 mg/kg using a 1:1000 solution into the anterolateral thigh; limit the dose to a maximum of 0.5 mg in adults and 0.3 mg in children, and repeat every 5–15 minutes as clinically indicated. 5
In adults, repeat IM dosing every 5–15 minutes based on the observed clinical response to the initial dose. 5

For children weighing less than 30 kg, administer epinephrine 0.01 mg/kg (0.01 mL/kg of 1:1000 solution) with a ceiling of 0.3 mg per injection. 5

For patients weighing 7.5–15 kg, a 0.1 mg epinephrine autoinjector (newly available formulation) is recommended. 5

Prepare an epinephrine infusion by adding 1 mg of epinephrine (1 mL of 1:1000) to 1 L of 0.9 % saline; start the infusion at 2 µg/min (≈2 mL/min) and titrate upward as needed. 5
Titrate the IV infusion up to a maximum of 10 µg/min (≈10 mL/min) guided by blood pressure, heart rate, and oxygenation. 5

Epinephrine has no absolute contraindications in the treatment of anaphylaxis, even for elderly patients with cardiac disease, hypertension, or other comorbidities; the therapeutic benefits outweigh transient adverse effects such as pallor, tremor, anxiety, or palpitations. 5

For infants weighing more than 7.5 kg, using a 0.15 mg autoinjector is preferred over manual ampule/syringe dosing because it provides faster, more reliable delivery despite a modest potential for overdosing. 5

Withholding epinephrine because of fear of side‑effects is associated with higher mortality; the risk of death from untreated anaphylaxis far exceeds the risk of transient epinephrine‑related adverse events. 5