Ketotifen belongs to a group of allergy medications known as antihistamines. Specifically, it is an H1 receptor antagonist. This means that it blocks a specific type of histamine receptor in the body (known as H1 receptors). Since the symptoms of allergic reactions are partly caused by histamine, ketotifen can help prevent or relieve allergy symptoms.
In addition to blocking histamine receptors, this medication also seems to decrease the release of histamine from cells in the body and may also inhibit other substances (such as leukotrienes or eosinophils) produced by the body in response to an allergen.
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