Acute Urticaria Management

Introduction to Corticosteroid Use

The American College of Allergy, Asthma, and Immunology recommends prednisolone 50 mg daily for 3 days as the guideline-recommended corticosteroid regimen for acute urticaria in adults 1, 2, 3
Corticosteroids should only be added when antihistamines alone fail to control severe acute urticaria, as they are not first-line therapy 1, 2, 3

Start with second-generation H1 antihistamines (such as cetirizine, loratadine, fexofenadine, levocetirizine) at standard doses, as more than 40% of patients respond to antihistamines alone 2, 3
If inadequate response after 2-4 weeks, increase antihistamine dose up to 4 times the standard dose before adding corticosteroids 2, 3
Add prednisolone 50 mg orally daily for 3 days for severe acute urticaria not responding to antihistamines, with lower doses frequently effective and considered to minimize corticosteroid exposure 1, 2, 3

Despite limited evidence, guidelines still recommend short-course prednisolone for severe acute urticaria based on clinical experience and the need for rapid symptom control in severe cases 1, 2, 3

Hydrocortisone is NOT recommended as routine treatment for urticaria, with prednisolone preferred 3
Hydrocortisone 200 mg IV may be reserved only for urticaria occurring during infusion reactions (e.g., IV iron) 3

Long-term oral corticosteroids should NEVER be used in chronic urticaria except in very selected cases under regular specialist supervision (Strength of recommendation A) 1, 2, 3
For antihistamine-refractory chronic urticaria, consider omalizumab 300 mg subcutaneously every 4 weeks (preferred second-line) 4, 2, 3
Cyclosporine 4 mg/kg daily for up to 2 months may be effective in two-thirds of severe autoimmune urticaria cases 5, 1, 2, 3

The most critical error is using chronic corticosteroids for chronic spontaneous urticaria, leading to cumulative toxicity without sustained benefit 1, 2, 3
Do not use corticosteroids as first-line treatment when antihistamines are sufficient, and always attempt antihistamine dose escalation first 2, 3
Never continue corticosteroids beyond 3-10 days due to cumulative toxicity 1, 2
Avoid using methylprednisolone or dexamethasone as routine choices, with prednisolone 50 mg daily for 3 days as the guideline-specified regimen 1, 2