Urticaria Management Guidelines

Immediate Management

Administer cetirizine 10 mg IV or PO as the preferred initial agent due to its rapid onset, which is advantageous when rapid relief is needed, as recommended by the American College of Allergy, Asthma, and Immunology 1
Alternative second-generation antihistamines include loratadine 10 mg PO if cetirizine is unavailable or not tolerated, according to the American Academy of Allergy, Asthma, and Immunology 2, 1

Observe for 90 minutes after initial dose to assess response and monitor for any progression of symptoms, as suggested by the American Academy of Pediatrics 3
Rule out anaphylaxis by assessing for respiratory symptoms, cardiovascular symptoms, or gastrointestinal symptoms beyond isolated urticaria, as recommended by the American Academy of Pediatrics 4

If symptoms persist after 2-4 weeks, increase cetirizine dose up to 4 times the standard dose, as supported by guideline recommendations for inadequate symptom control from the American College of Allergy, Asthma, and Immunology 1, 5
Consider switching to a different second-generation antihistamine, such as desloratadine 5 mg daily or levocetirizine 5 mg daily, if cetirizine is ineffective, as suggested by the American College of Allergy, Asthma, and Immunology 1, 5
Add a short course of oral corticosteroids, such as hydrocortisone 200 mg IV acutely or prednisone 0.5-1 mg/kg/day PO for 3-10 days, only for severe acute exacerbations, as recommended by the American Society of Hematology 2, 6, 5

Assess for potential medication triggers, including NSAIDs, aspirin, ACE inhibitors, and codeine, as these can precipitate or worsen urticaria, according to the American College of Allergy, Asthma, and Immunology 1, 5
ACE inhibitors should be avoided if the patient has any component of angioedema, as 3-5% of patients on ACE inhibitors develop angioedema, as recommended by the American College of Cardiology 1

Apply cooling antipruritic lotions, such as calamine or 1% menthol in aqueous cream, for additional symptomatic relief, as suggested by the American College of Allergy, Asthma, and Immunology 1, 5
Minimize aggravating factors, including overheating, stress, and alcohol, as recommended by the American College of Allergy, Asthma, and Immunology 1, 5

Continue high-dose second-generation antihistamines, up to 4x standard dose, as first-line therapy, as recommended by the American College of Allergy, Asthma, and Immunology 1, 5
Add omalizumab 300 mg subcutaneously every 4 weeks if inadequate response to high-dose antihistamines after 2-4 weeks, allowing up to 6 months for response, as suggested by the American College of Allergy, Asthma, and Immunology 1, 5
Consider cyclosporine, up to 5 mg/kg body weight, as third-line therapy if both high-dose antihistamines and omalizumab fail, with monitoring of blood pressure and renal function every 6 weeks, as recommended by the American College of Allergy, Asthma, and Immunology 1, 5