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    Ketotifen is an antihistamine for the eye that treats allergic symptoms by blocking histamine. It is also a mast cell stabilizer that prevents allergic reactions by reducing the release of natural substances that cause an allergic reaction. Ketotifen is available in two forms:
    webmd.com+2
    1. Ophthalmic form (eye drops or drug-eluting contact lenses): Used to treat allergic conjunctivitis.
      wikipedia.org
    2. Oral form (tablets or syrup): Used to prevent asthma attacks or anaphylaxis, as well as various mast cell, allergic-type disorders.
      wikipedia.org

    4 Sources

    Ketotifen Fumarate Drops - Uses, Side Effects, and More - WebMD
    Ketotifen is an antihistamine and mast cell stabilizer for the eye that treats allergic conjunctivitis. Learn how to use it, what side effects to watch out for, and what precaution…
    WebMD
    https://www.webmd.com/drugs/2/drug-17383/ketotifen-ophthalmic-eye/details
    Zaditor eye drops (Ketotifen): Uses, Dosage, Side Effects & More - GoodRx
    Zaditor (ketotifen) is an antihistamine eye drop that's available over the counter for allergy-related itchy eyes. It works by blocking histamine and stopping your body from releas…
    GoodRx
    https://www.goodrx.com/zaditor/what-is
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    Ketotifen Ophthalmic: MedlinePlus Drug Information
    Ketotifen ophthalmic is an antihistamine eye drop used to treat allergic pinkeye. Learn how to use it, what precautions to follow, and what side effects to expect.
    MedlinePlus
    https://medlineplus.gov/druginfo/meds/a604033.html
    Ketotifen - Wikipedia
    Ketotifen, an antihistamine medication and a mast cell stabilizer, is most commonly sold as a salt with fumaric acid, ketotifen fumarate, and is available in two forms: [6]
    Wikipedia
    https://en.wikipedia.org/wiki/Ketotifen
    webmd.com
    goodrx.com
    medlineplus.gov
    wikipedia.org