Urticaria Treatment Guidelines

Introduction to Urticaria Treatment

The American Academy of Allergy, Asthma, and Immunology recommends starting with second-generation non-sedating H1 antihistamines as first-line therapy, escalating the dose up to 4 times standard if needed, adding omalizumab 300 mg every 4 weeks for chronic cases unresponsive to high-dose antihistamines, and reserving cyclosporine for patients who fail omalizumab 1, 2

Begin immediately with a second-generation non-sedating H1 antihistamine (cetirizine, desloratadine, fexofenadine, levocetirizine, loratadine, or mizolastine) for both acute and chronic urticaria 1, 2, 3
Offer patients at least two different antihistamine options, as individual responses and tolerance vary significantly between agents 1, 3
First-generation antihistamines (diphenhydramine, hydroxyzine, chlorpheniramine) should be avoided as primary therapy due to significant sedation and anticholinergic effects, though they may be added at night for additional symptom control if needed 2, 3

If standard dosing provides inadequate control within 24-48 hours for acute urticaria or 2-4 weeks for chronic urticaria, increase the antihistamine dose up to 4 times the standard dose when benefits outweigh risks 1, 2, 3, 4

For chronic spontaneous urticaria (CSU) unresponsive to high-dose antihistamines, add omalizumab (anti-IgE monoclonal antibody) 300 mg subcutaneously every 4 weeks 1, 4
Allow up to 6 months for patients to respond to omalizumab before considering it a treatment failure 1, 4

For patients who do not respond to high-dose antihistamines and omalizumab, add cyclosporine 4 mg/kg daily (up to 5 mg/kg) for up to 2 months 1, 2, 4
Cyclosporine is effective in approximately 65-70% of patients with severe autoimmune urticaria 1, 2

Avoid acrivastine in moderate renal impairment 1
Halve the dose of cetirizine, levocetirizine, and hydroxyzine in moderate renal impairment 1, 2
Avoid cetirizine, levocetirizine, and alimemazine in severe renal impairment 1
Avoid mizolastine in significant hepatic impairment 1, 2
Avoid alimemazine, chlorphenamine, and hydroxyzine in severe liver disease 1, 2
Avoid antihistamines during pregnancy if possible, especially during the first trimester 1, 2
If necessary, choose chlorphenamine due to its long safety record 1, 2

Perform thorough history and physical examination, including review of pictures of wheals and/or angioedema 4
Basic tests should include differential blood count, C-reactive protein or ESR, total IgE, and IgG-anti-thyroid peroxidase (TPO) levels 4
Testing for IgG-anti-TPO and total IgE helps identify autoimmune CSU: patients with autoimmune CSU typically have low or very low total IgE levels and elevated IgG-anti-TPO 4
A high ratio of IgG-anti-TPO to total IgE is currently the best surrogate marker for autoimmune CSU 4