Urticaria Treatment Guidelines

First-Line Treatment

• Second-generation non-sedating H1 antihistamines are the mainstay of therapy for both acute and chronic urticaria, with options including cetirizine, desloratadine, fexofenadine, levocetirizine, loratadine, and mizolastine, as recommended by the British Journal of Dermatology 1, 2
• Patients should be offered at least two different non-sedating antihistamines, as responses and tolerance vary between individuals, according to the British Journal of Dermatology and Praxis Medical Insights 1, 2

Dose Escalation for Inadequate Response

• For inadequate symptom control, increasing the dose up to 4 times the standard dose is recommended when potential benefits outweigh risks, as suggested by Praxis Medical Insights 2, 1
• First-generation antihistamines may be added at night for additional symptom control, as recommended by the British Journal of Dermatology 3

Second-Line Treatment

• Omalizumab (anti-IgE monoclonal antibody) is recommended for chronic spontaneous urticaria unresponsive to high-dose antihistamines, with a standard starting dose of 300 mg every 4 weeks, as recommended by Praxis Medical Insights 2, 4
• Allow up to 6 months for patients to respond to omalizumab before considering alternative treatments, according to Praxis Medical Insights 2

Third-Line Treatment

• Cyclosporine is recommended for patients who do not respond to high-dose antihistamines and omalizumab, with a dose of 4 mg/kg daily for up to 2 months, as suggested by Praxis Medical Insights 2, 4
• Regular monitoring of blood pressure and renal function is required due to potential side effects, as recommended by Praxis Medical Insights 2, 4

Corticosteroids

• Oral corticosteroids should be restricted to short courses for severe acute urticaria or angioedema affecting the mouth, as recommended by the British Journal of Dermatology 3

Special Considerations

Angioedema

• For hereditary angioedema, C1 inhibitor concentrate should be given for emergency treatment of serious attacks or as prophylaxis before surgery, as recommended by the British Journal of Dermatology 3
• Anabolic steroids are the treatment of choice for maintenance therapy in most adults with hereditary angioedema, according to the British Journal of Dermatology 3

General Measures

• Identify and minimize aggravating factors such as overheating, stress, alcohol, and certain medications (aspirin, NSAIDs, codeine), as recommended by the British Journal of Dermatology and Praxis Medical Insights 1, 4
• NSAIDs should be avoided in aspirin-sensitive patients with urticaria, as suggested by the British Journal of Dermatology 1
• ACE inhibitors should be avoided in patients with angioedema without wheals, according to the British Journal of Dermatology and Praxis Medical Insights 1, 4

Special Populations

• In renal impairment: Avoid acrivastine in moderate renal impairment; halve the dose of cetirizine, levocetirizine, and hydroxyzine, as recommended by Praxis Medical Insights 2
• In hepatic impairment: Avoid mizolastine in significant hepatic impairment, according to Praxis Medical Insights 2
• In pregnancy: Avoid antihistamines if possible, especially during the first trimester; choose chlorphenamine if necessary due to its long safety record, as suggested by Praxis Medical Insights 2

Prognosis

• About 50% of patients with chronic urticaria presenting with wheals alone will be clear by 6 months, as reported by the British Journal of Dermatology 3
• Patients with wheals and angioedema have a poorer outlook, with over 50% still having active disease after 5 years, according to the British Journal of Dermatology 3

Hydroxyzine for Itching from Hives

Efficacy and Placement in Treatment Algorithm

• The British Journal of Dermatology recommends that hydroxyzine is generally not used as first-line monotherapy due to its sedating properties 5

Recommended Usage of Hydroxyzine for Urticaria

• Hydroxyzine can be used as an adjunct therapy at night to help patients sleep better, as suggested by the British Journal of Dermatology 5, 6

Side Effects and Precautions

• The British Journal of Dermatology advises that hydroxyzine should be avoided in severe liver disease and early stages of pregnancy due to its sedating effects 5, 7
• The dose of hydroxyzine should be adjusted in patients with moderate renal impairment, as recommended by the British Journal of Dermatology 8

Treatment of Refractory Urticaria

Third-Line Treatment Options

• The British Association of Dermatologists recommends adding cyclosporine 4 mg/kg daily (up to 5 mg/kg) for up to 2 months if omalizumab fails, which is effective in approximately 65-70% of patients with severe urticaria unresponsive to antihistamines 9, 10
• The treatment duration of 16 weeks is superior to 8 weeks for reducing therapeutic failures, and patients should be monitored for potential nephrotoxicity and hypertension 9

Emergency Management

• The British Association of Dermatologists recommends administering intramuscular epinephrine 0.5 mL of 1:1000 (500 µg) immediately for severe urticaria with anaphylaxis or angioedema affecting the airway 10
• Fixed-dose epinephrine pens (300 µg for adults) should be prescribed for patients at risk of life-threatening attacks, as recommended by the British Association of Dermatologists 10