What it is used for
- Allergic conjunctivitis (itchy, red, watery eyes from allergy)
- Eye symptoms of hay fever
How it works
Ketotifen blocks histamine, which causes allergic itch and redness, and also helps stop eye cells from releasing more allergy chemicals. This relieves and helps prevent itchy, red, watery eyes caused by allergies.
How it is taken
Comes as eye drops, including over-the-counter products. A drop is placed into the affected eye(s). Wash your hands first and keep the dropper tip clean. Use it exactly as your pharmacist or the label directs. If you wear soft contact lenses, ask a pharmacist about timing before reinserting them.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Mild stinging or burning on application
- Brief blurred vision
- Dry eyes
- Headache
- Eyelid irritation
Serious effects — get help
- Signs of an allergic reaction such as facial swelling, severe rash or breathing difficulty
- Worsening eye pain, swelling or vision changes
- Signs of eye infection such as thick discharge
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Other eye drops (space applications apart; ask a pharmacist)
- Soft contact lenses (check timing with a pharmacist)
Who should take care
- Tell your clinician if you are pregnant or breastfeeding
- Not for treating contact-lens-related irritation
- Stop and seek advice if symptoms worsen or do not improve
- Not suitable if allergic to ketotifen