This medication is used to prevent and treat itching of the eyes caused by allergies (allergic/seasonal conjunctivitis). Ketotifen is an antihistamine for the eye that treats allergic symptoms by blocking a certain natural substance (histamine). It is also a mast cell stabilizer that prevents allergic reactions by reducing the release of natural substances that cause an allergic reaction.

If you are using the over-the-counter product, read all directions on the product package before using this medication. If your doctor has prescribed this medication, use it exactly as directed.

Use this medication in the affected eye(s) as directed by the product package or by your doctor, usually twice a day (every 8 to 12 hours).

Dosage is based on your medical condition and response to treatment.

To apply eye drops, wash your hands first. To avoid contamination, do not touch the dropper tip or let it touch your eye or any other surface.

Ask your doctor if you can wear contact lenses while you are being treated with this medication. If your doctor says you may continue wearing them, remove them before using the eye drops, and wait at least 10 minutes after each dose before putting in your lenses. Do not use this medication to treat irritation from contact lens wear. Consult your doctor about the use of contact lenses when the eyes are red or irritated.

Tilt your head back, look upward, and pull down the lower eyelid to make a pouch. Hold the dropper directly over your eye and apply 1 drop in the lower eyelid. Look downward and gently close your eyes for 1 to 2 minutes. Place one finger at the corner of your eye (near the nose) and apply gentle pressure. This will prevent the medication from draining out. Try not to blink and do not rub your eye.

Do not rinse the dropper. Replace the dropper cap after each use, and keep the bottle tightly closed.

If you are using another kind of eye medication (drops or ointment), wait at least 5 minutes before applying it. Apply eye drops before eye ointments to allow the eye drops to enter the eye.

Wait several minutes for your vision to clear before driving or operating machinery.

If your doctor has prescribed this medication, use it regularly in order to get the most benefit from it. To help you remember, use it at the same times each day. Continue to use this medication as prescribed until pollen season is over or you are no longer exposed to the allergic substance, even when allergic symptoms disappear or improve.

If your condition lasts or gets worse, if you develop new symptoms, or if you think you have a serious medical problem, get medical help right away. If you are treating yourself with nonprescription ketotifen, tell your doctor if your itching gets worse or lasts more than 72 hours. You may need a different medication.

Burning/stinging/irritation of the eye, headache, stuffy/runny nose, bad taste in your mouth, and increased sensitivity to light may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

If your doctor has directed you to use this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including:

• dry eyes
• eye pain
• increased redness/swelling of the eye
• vision problems

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:

• rash
• itching/swelling (especially of the face/tongue/throat)
• severe dizziness
• trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Before using ketotifen, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients (such as the preservative benzalkonium chloride in the multi-dose container), which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

• eye problems (such as glaucoma)

After you apply this drug, your vision may become temporarily blurred. Do not drive, use machinery, or do anything that needs clear vision until you can do it safely.

Do not use this medication in children younger than 3 years unless directed by the doctor.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

This medicine may be harmful if swallowed. If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call 1-800-222-1222. Canada residents can call 1-844-764-7669.

Do not share this medication with others.

Avoid allergens (such as pollen, animal dander) and other triggering factors (such as irritants). Cold compresses and lubricating eye drops may decrease eye irritation.

If you are using this medication on a regular schedule and miss a dose, use it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Use your next dose at the regular time. Do not double the dose to catch up.

Different brands of this medication have different storage needs. Check the product package for instructions on how to store your brand, or ask your pharmacist. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.