Can metoprolol cause hives (urticaria)?

Can Metoprolol Cause Hives?

Yes, metoprolol can cause hives (urticaria), though this is an uncommon adverse reaction. The FDA drug label for metoprolol explicitly lists "pruritus or rash" occurring in approximately 5 of 100 patients, with urticaria specifically mentioned among cardiovascular adverse reactions 1.

Evidence from Drug Labeling

The official FDA labeling for metoprolol tartrate documents hypersensitivity reactions including:

• Pruritus or rash in about 5% of patients (1 in 20)
• Urticaria as a recognized adverse effect
• Very rare reports of photosensitivity and worsening of psoriasis 1

The label also notes that "fever combined with aching and sore throat, laryngospasm and respiratory distress" can occur as hypersensitivity reactions, indicating the potential for more severe allergic manifestations 1.

Clinical Case Evidence

Published case reports confirm real-world occurrences:

• A 72-year-old woman developed severe angioedema after intravenous metoprolol administration, requiring treatment with steroids and diphenhydramine 2
• A 36-year-old woman developed erythema multiforme (a more severe skin reaction) after low-dose metoprolol succinate 3
• Multiple cases of psoriasiform and eczematous skin lesions confirmed by oral provocation testing 4

Clinical Context: Beta-Blocker Class Effect

Allergic reactions to beta-blockers are extremely rare overall 5. However, when they occur:

• Urticaria can present as an immediate hypersensitivity reaction
• Cross-reactivity between different beta-blockers is possible but not universal
• Alternative beta-blockers (particularly second-generation selective agents like bisoprolol) may be tolerated 5

Management Approach

If hives develop after starting metoprolol:

1. Discontinue the medication immediately - Do not abruptly stop in patients with coronary artery disease; taper over 1-2 weeks while monitoring closely 1

2. Treat the urticaria symptomatically:

   • H1-antihistamines (e.g., cetirizine, levocetirizine) as first-line
   • Consider H2-antihistamines (ranitidine, cimetidine) for refractory cases
   • Short-course systemic corticosteroids may be considered for severe cases, though evidence shows modest benefit 6, 7

3. Distinguish from anaphylaxis: If hives are accompanied by respiratory symptoms (dyspnea, wheezing, bronchospasm), hypotension, or angioedema, this represents anaphylaxis requiring immediate epinephrine administration 8

4. Consider alternative therapy: If beta-blockade is still needed, a different beta-blocker (particularly a second-generation selective agent) may be tried under close supervision, as cross-reactivity is not guaranteed 5

Important Caveats

• Beta-blockers can mask anaphylaxis symptoms by blunting tachycardia, making recognition more difficult 9
• Patients with pre-existing urticaria or atopic conditions may be at higher risk
• The reaction typically occurs within the first few doses but can develop during chronic therapy 4
• Document the reaction clearly to prevent future re-exposure

The incidence of true allergic urticaria to metoprolol is low (approximately 5% for any rash/pruritus), but when it occurs, it requires medication discontinuation and appropriate symptomatic management.