ImportantThis page is general information, not a prescription. Don't start, stop, or change a medicine without talking to your provider or pharmacist.
Overview
It both blocks histamine and calms the cells that release it.
What it's used for
- Itchy eyes from allergies
How to take it
- Wash your hands, tilt your head back, and put a drop in the pocket of the lower lid without touching the tip to your eye.
- Wait 5 minutes between different eye drops.
- Use twice a day, about 8 to 12 hours apart.
- Wait 10 minutes before putting in contact lenses.
Your dose depends on your health and other medicines. Always follow your prescription label, and ask your pharmacist if anything is unclear.
Side effects
Common side effects
- Mild stinging
- Red eyes
Call your provider todayEye pain, vision changes, or worsening redness
Warnings
- Don't use for red eyes from contact lens irritation.
Other medicines, foods, and alcohol
- Few interactions.
Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.
Pregnancy and breastfeeding
Ask your provider.
Missed doses, overdose, and storage
If you miss a dose
Apply it when you remember, then go back to your usual schedule. Don't apply extra to make up for it.
If someone takes too much
Call Poison Control at 1-800-222-1222 or get help online at poison.org. Call 911 if the person collapses, has a seizure, has trouble breathing, or can't be woken.
Storing it
Store at room temperature, away from heat and moisture (not in the bathroom), and out of reach of children and pets.
Conditions it's used for
Sources
- DailyMed: FDA drug label for Ketotifen eye drops (U.S. National Library of Medicine)
- MedlinePlus: Drugs, herbs, and supplements
- FDA: Drugs@FDA
Last updated 2026-11-13.