Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using ketotifen ophthalmic and call your doctor at once if you have any of these serious side effects:
- 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.
Less serious 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.