What side effects may I notice from receiving Ketotifen?

Side effects that you should report to your doctor or health care professional as soon as possible:
-skin rash, hives, or itching
-swelling of the lips, tongue or face

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-burning, discomfort, stinging, or tearing immediately after use
-eyelid swelling or eye dryness
-headache
-sensitivity of the eyes to sunlight

This list may not describe all possible side effects for Ketotifen. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.