Monoclonal Antibodies · Pharmacology

What is the primary mechanism of action of Omalizumab in the management of severe asthma?

  1. It blocks the IL-5 receptor on the surface of eosinophils
  2. It binds free IgE, preventing it from attaching to mast cells
  3. It inhibits the release of leukotrienes from activated neutrophils
  4. It acts as an antagonist at the muscarinic M3 receptor
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Correct answer: It binds free IgE, preventing it from attaching to mast cells

Omalizumab is a humanized monoclonal antibody that selectively binds to circulating IgE. This prevents IgE from attaching to the high-affinity FcεRI receptors on mast cells and basophils, thereby limiting the allergic inflammatory response.

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