Ketotifen is an antihistamine that inhibits the body’s release of a chemical called histamine. Histamine can produce allergy symptoms such as sneezing, runny nose, and watery eyes.

Ketotifen ophthalmic is used to treat itching of the eyes caused by allergy to dust, pollen, animals, or other allergens.

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  • Alaway, Zaditor
  • Severity: Moderate
    If any of the following side effects occur while taking ketotifen ophthalmic, check with your doctor or nurse as soon as possible:

    Less common:
    Chills
    cough
    diarrhea
    fever
    general feeling of discomfort or illness
    headache
    joint pain
    loss of appetite
    muscle aches and pains
    nausea
    runny nose
    shivering
    sore throat
    sweating
    trouble sleeping
    unusual tiredness or weakness
    vomiting
    Rare:
    Abdominal or stomach pain
    blistering, itching, peeling, or redness of skin
    bloody or cloudy urine
    clay-colored stools
    convulsions
    dark urine
    difficult, burning, or painful urination
    dizziness
    frequent urge to urinate
    muscle spasm or jerking of all extremities
    rash
    sudden loss of consciousness
    unpleasant breath odor
    vomiting of blood
    yellow eyes or skin
    Symptoms of overdose:
    If any of the following symptoms of overdose occur while taking ketotifen ophthalmic, get emergency help immediately:

    Blurred vision
    confusion
    convulsions
    disorientation
    dizziness
    drowsiness (severe)
    faintness or lightheadedness when getting up from a lying or sitting position
    fast, pounding, or irregular heartbeat or pulse
    hyperexcitability
    loss of consciousness
    palpitations
    sweating
    unusual tiredness or weakness
    Severity: Minor
    Some of the side effects that can occur with ketotifen ophthalmic may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

    More common:
    Weight gain
    Less common or rare:
    Bloody nose
    drowsiness
    dryness of mouth
    excitation
    increased appetite
    irritability
    nervousness
    swelling of eyelids
    unexplained nosebleeds
  • (ophthalmic solution)