Allergies Home > Zaditor

Zaditor is an eye medication approved for treating itching due to allergies. It is a type of antihistamine that works by blocking H1 receptors and decreasing the release of histamine from cells in the body. This medication is available over-the-counter and comes in the form of an eyedrop that is applied twice a day. Potential side effects include headache, red eyes, and runny nose.

What Is Zaditor?

Zaditor® (ketotifen ophthalmic solution) is a non-prescription eyedrop used to temporarily relieve itching due to eye allergies (known medically as allergic conjunctivitis).
(Click Zaditor Uses for more information, including possible off-label uses.)

Who Makes This Medication?

Zaditor is manufactured by Novartis Pharmaceuticals Corporation.

How Does Zaditor Work?

This drug 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, Zaditor can help prevent or relieve allergy symptoms.
In addition to blocking histamine receptors, Zaditor seems to decrease the release of histamine from cells in the body and may also inhibit other substances produced by the body in response to an allergen, such as leukotrienes or eosinophils.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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