Efficacy and Safety of Systemic Corticosteroids for Urticaria: A systematic review and meta-analysis of randomized clinical trials

Background Short courses of adjunctive systemic corticosteroids are commonly used to treat acute urticaria and chronic urticaria flares (both with or without mast cell-mediated angioedema), but their benefits and harms are unclear. Objective To evaluate the efficacy and safety of treating acute urticaria or chronic urticaria flares with versus without systemic corticosteroids. Methods We searched MEDLINE, EMBASE, CENTRAL, CNKI, VIP, Wanfang, and CBM databases from inception to July 8, 2023 for randomized controlled trials of treating urticaria with versus without systemic corticosteroids. Paired reviewers independently screened records, extracted data, and appraised risk of bias with the Cochrane 2.0 tool. We did random effects meta-analyses of urticaria activity, itch severity and adverse events. We assessed certainty of the evidence using the GRADE approach. Results We identified 12 randomized trials enrolling 944 patients. For patients with low or moderate probability (17.5% to 64%) to improve with antihistamines alone, add-on systemic corticosteroids likely improve urticaria activity by a 14% to 15% absolute difference (odds ratio [OR] 2.17, 95%CI 1.43-3.31; Number needed to treat [NNT] 7; Moderate certainty). Among patients with a high chance (95.8%) for urticaria to improve with antihistamines alone, add-on systemic corticosteroids likely improved urticaria activity by a 2.2% absolute difference (NNT, 45; Moderate certainty). Corticosteroids may improve itch severity (OR, 2.44; 95%CI 0.87-6.83; Risk difference, 9%; NNT, 11; Low certainty). Systemic corticosteroids also likely increase adverse events (OR, 2.76; 95%CI 1.00-7.62; Risk difference, 15%; number needed to harm [NNH], 9; Moderate certainty). Conclusion Systemic corticosteroids for acute urticaria or chronic urticaria exacerbations likely improve urticaria, depending on antihistamine-responsiveness, but also likely increase adverse effects in approximately 15% more.