What steroid regimen is recommended for treating acute urticaria?

Steroid Regimen for Acute Urticaria

For acute urticaria, add a short 3-day course of oral prednisolone 50 mg daily to second-generation antihistamines only in moderate to severe cases, rather than using steroids as first-line therapy. 1

First-Line Treatment: Antihistamines Alone

• Start with a second-generation H1-antihistamine (cetirizine 10 mg or loratadine 10 mg once daily) as the definitive initial treatment for acute urticaria 1, 2
• Cetirizine reaches peak plasma concentration fastest and is preferred when rapid symptom control is needed 2
• Second-generation antihistamines are safer than first-generation agents, avoiding sedation, cognitive impairment, and cardiac risks 3

When to Add Corticosteroids

Critical evidence gap: Recent systematic review of acute urticaria treatment found that adding prednisone to antihistamines did not improve symptoms compared to antihistamine alone in 2 out of 3 randomized trials 4

Despite limited evidence, consider a short steroid course only when:

• Moderate to severe acute urticaria with significant symptoms despite antihistamines 1
• Use prednisolone 50 mg daily for 3 days as a bridge therapy 1
• Restrict corticosteroid courses to 3-10 days maximum due to cumulative toxicity risks including adrenal suppression, osteoporosis, diabetes, and hypertension 2

Dose Escalation Strategy (Before Adding Steroids)

• If standard antihistamine dosing provides inadequate control after 24-48 hours, increase the dose up to 4 times the standard dose 1
• This approach achieves sufficient response in approximately 23% of patients who failed standard dosing 2
• Assess response after 2-4 weeks at standard dosing; escalation can occur earlier if symptoms are intolerable 1

Important Caveats

Steroids are NOT first-line: Systemic corticosteroids should be avoided as initial therapy for urticaria 2

Limited efficacy data: Meta-analysis shows corticosteroids likely improve urticaria activity by only 14-15% but increase adverse events in approximately 15% more patients (OR 2.76) 2

No role in prevention: Corticosteroids have no proven role in preventing biphasic reactions, with very low quality evidence and a number needed to treat of 161 patients 2

Adjunctive Symptomatic Measures

• Apply cooling antipruritic lotions (calamine or 1% menthol in aqueous cream) for symptomatic relief 1, 2
• Eliminate triggering factors: NSAIDs, aspirin, codeine, overheating, stress, and alcohol 1, 2

Emergency Recognition

• If urticaria presents with signs of anaphylaxis (hypotension, angioedema of tongue/airway, respiratory distress), immediately administer intramuscular epinephrine 0.3-0.5 mg into the anterolateral thigh before any antihistamine or corticosteroid 5, 1, 2
• Epinephrine is the sole first-line medication for anaphylaxis; using antihistamines or corticosteroids first delays essential therapy 2