Management of NSAID-Induced Anaphylaxis

Immediate Management

• The American Academy of Allergy, Asthma, and Immunology recommends prompt administration of intramuscular epinephrine as the first-line treatment for anaphylaxis, including NSAID-induced anaphylaxis, followed by supportive care and observation for potential biphasic reactions 1, 2, 3
• Administer epinephrine 1:1000 (1 mg/mL) at a dose of 0.2-0.5 mL (0.01 mg/kg in children, maximum 0.3 mg) intramuscularly into the lateral thigh (vastus lateralis) 4
• Repeat epinephrine every 5 minutes as necessary to control symptoms and blood pressure 4
• Place patient in recumbent position and elevate lower extremities 4
• Establish and maintain airway (endotracheal intubation or cricothyrotomy may be required in severe cases) 4
• Administer oxygen at 6-8 L/min 4
• Establish venous access 4
• Administer normal saline for fluid replacement (may require 1-2 L in adults) 4
• For hypotension refractory to epinephrine and volume replacement, consider vasopressors such as dopamine (400 mg in 500 mL D5W at 2-20 μg/kg/min) 5

Second-Line Treatments

• Administer diphenhydramine 1-2 mg/kg or 25-50 mg parenterally 5
• Consider adding ranitidine 1 mg/kg or 50 mg IV (diluted in 5% dextrose to 20 mL, administered over 5 minutes) 5
• Note: Antihistamines are second-line therapy and should never be used alone to treat anaphylaxis 1
• Consider nebulized albuterol 2.5-5 mg in 3 mL saline if bronchospasm is resistant to epinephrine 5
• Consider glucagon 1-5 mg IV (20-30 μg/kg, maximum 1 mg in children) over 5 minutes followed by infusion (5-15 μg/min) if beta-blocker therapy complicates treatment 5
• Consider systemic glucocorticosteroids for patients with history of asthma or severe/prolonged anaphylaxis 5
• IV steroids should be administered every 6 hours at a dosage equivalent to methylprednisolone 1.0-2.0 mg/kg/day 5
• Oral prednisone 0.5 mg/kg may be sufficient for less critical episodes 5
• Note: Corticosteroids are not helpful acutely but may prevent recurrent or protracted anaphylaxis 5

Management of Cardiopulmonary Arrest

• Implement cardiopulmonary resuscitation and advanced cardiac life support measures 5
• Consider high-dose IV epinephrine: 1-3 mg (1:10,000 dilution) slowly over 3 minutes, then 3-5 mg over 3 minutes, followed by 4-10 μg/min infusion 5
• For children, initial resuscitation dose is 0.01 mg/kg (0.1 mL/kg of 1:10,000 solution) 5

Post-Acute Care

• Refer patient to an allergist for comprehensive evaluation 6
• Identify the specific NSAID trigger through history and follow-up testing 6
• Provide patient education on avoidance of the triggering medication 6
• Prescribe self-injectable epinephrine and educate on proper use 6
• Advise patient to wear medical identification (e.g., Medic Alert jewelry) 7

Special Considerations

• Concomitant beta-blocker therapy is a risk factor for severe reactions 5
• Delaying epinephrine administration is a common pitfall to avoid (epinephrine is the drug of choice and should be given promptly) 8
• Using antihistamines or corticosteroids as first-line treatment instead of epinephrine is a common pitfall to avoid 1
• Failing to place patient in recumbent position may worsen hypotension 4
• Inadequate fluid resuscitation in hypotensive patients is a common pitfall to avoid 4
• Emphasize that the patient is at risk for repeat episodes of anaphylaxis 6
• Instruct to administer epinephrine at the first sign of recurrence and immediately seek emergency care 6
• Advise to routinely check the expiration date of the auto-injector 6