Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Stop using ketotifen ophthalmic and call your doctor at once if you have:
redness, drainage, eyelid swelling, or other signs of infection;
eye pain;
vision changes; or
severe itching of the eyes worse than before using the medication.
Common side effects may include:
mild burning, stinging, or eye irritation;
dryness of the eyes; or
increased sensitivity to light.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Ketotifen ophthalmic side effects (more detail)
