Acute Urticaria Management

First-Line Treatment

The American Academy of Allergy, Asthma, and Immunology recommends non-sedating second-generation H1 antihistamines as the mainstay of therapy for acute urticaria, with options including cetirizine 10 mg daily, loratadine 10 mg daily, fexofenadine, desloratadine, and levocetirizine 1, 2
For mild cases of acute urticaria (hives covering <10% body surface area), the European Academy of Allergy and Clinical Immunology suggests continuing with the standard dose of oral antihistamines and adding topical corticosteroids if needed (Class I for body, Class V/VI for face) 1, 2

The American College of Allergy, Asthma, and Immunology recommends increasing the antihistamine dose up to 4 times the standard dose when benefits outweigh risks for moderate cases of acute urticaria (10-30% body surface area) or inadequate response to standard dose 1, 2
The British Society for Allergy and Clinical Immunology suggests continuing oral antihistamines (cetirizine/loratadine 10 mg daily or hydroxyzine 10-25 mg QID) for moderate cases of acute urticaria 2

The European Academy of Allergy and Clinical Immunology recommends systemic corticosteroids (prednisone 0.5-1 mg/kg/day) until hives resolve to grade 1 for severe cases of acute urticaria (>30% body surface area) or inadequate response to increased antihistamine dosing 2
The American Academy of Allergy, Asthma, and Immunology suggests considering same-day dermatology consultation for severe cases of acute urticaria 2
The British Society for Allergy and Clinical Immunology recommends ruling out systemic hypersensitivity with CBC with differential and CMP for severe cases of acute urticaria 2

The American Academy of Pediatrics recommends assessing for airway compromise in cases with angioedema 3
The European Academy of Allergy and Clinical Immunology suggests considering epinephrine for severe symptoms affecting breathing in cases with angioedema 3
The American College of Allergy, Asthma, and Immunology recommends identifying and minimizing aggravating factors such as overheating, stress, alcohol, and certain medications (aspirin, NSAIDs, codeine) 1, 3

The British Society for Allergy and Clinical Immunology suggests considering cooling antipruritic lotions (calamine or 1% menthol in aqueous cream) for symptomatic relief 1
The European Academy of Allergy and Clinical Immunology recommends considering proton pump inhibitor for GI prophylaxis for patients on systemic corticosteroids 2
The American Academy of Allergy, Asthma, and Immunology suggests adding PCP prophylaxis if treatment exceeds 3 weeks at >30 mg prednisone equivalent/day for patients on systemic corticosteroids 2

The American Academy of Allergy, Asthma, and Immunology recommends doubling the standard dose of cetirizine to 20 mg once daily if symptoms persist after 2-4 weeks on standard dosing, with guidelines supporting up to 4-fold dose increases when benefits outweigh risks 4
Doubling the dose of cetirizine significantly improves wheal severity and itching in patients refractory to standard doses, with the primary side effect of higher dosing remaining mild sedation, affecting 13.7% of patients ≥12 years 5, 4

The American Academy of Allergy, Asthma, and Immunology suggests assessing response after 2-4 weeks of standard dosing before considering dose escalation, with a strength of evidence supporting this approach 4