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Composition for K FEN


food interaction for K FEN

alcohol interaction for K FEN

pregnancy interaction for K FEN

lactation interaction for K FEN

It is better to take this medicine with food.
Interaction with alcohol is unknown. Please consult your doctor.
It may be unsafe to use during pregnancy.
Animal studies have shown adverse effects on the foetus, however, there are limited human studies. The potential benefits may outweigh the risks. Please consult your doctor.
Unknown. Human and animal studies are not available. Please consult your doctor.




K fen eye drop is used to treat allergic rhinitis (running nose), allergic conjunctivitis (irritation and redness in the membrane covering the eye), red itchy eyes due to allergies like hay fever (allergic inflammation of mucus membranes of the eyes and nose causing running nose and watery eyes) and to minimize the frequency and severity of asthma attacks.

How it works

K fen eye drop is an anti-allergic drug that belongs to a class of medication called mast cell stabilizers. It works by inhibiting the release of allergy-causing chemicals called histamines in body by mast cells.

Common side effects

Increased sensitivity to light, Acne-like rash, Allergic reaction, Itching, Blurred vision, Headache, Tingling sensation in eye, Burning sensation in eye, Dry eye, Eye discharge, Eye pain, Eyelid disorder, Increased production of tears, Influenza like symptoms, Running nose, Sore throat


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Expert advice for K FEN

  • Remove soft lenses from your eyes before instilling ketotifen eye drop and wait at least 15 minutes before reinserting lenses.
  • Keep a gap of at least 5 min before applying some other medicinal product.
  • Do not drive or operate heavy machineries as Ketotifen may cause blurred vision or drowsiness.
  • Avoid drinking alcohol while on ketotifen treatment as it may worsen the side effects.
  • Tell your doctor if you are taking medicines for depression or allergy.
  • Tell your doctor if you are or planning to become pregnant or are breastfeeding.

Frequently asked questions for K FEN


Q. Is ketotifen available over the counter?
Ketotifen eye drops are available over the counter. Ketotifen tablets and syrups are available only with doctor’s prescription.

Q. Is ketotifen legal?
 Ketotifen is legal and available worldwide in many countries.
Q. Is ketotifen a steroid?
Ketotifen is not a steroid.

Q. Is ketotifen an antihistamine?
It is an antihistaminic drug.
Q. Is ketotifen addictive?
Ketotifen is not addictive.

Q. Is ketotifen safe?
 Ketotifen is safe if taken as prescribed. In case of any side effects, consult your doctor.
Q. Does ketotifen cause weight gain, make you sleepy, or drowsy?
Ketotifen can cause weight gain, can make you sleepy and drowsy.
Q. How long does ketotifen take to work?
 Ketotifen oral (tablet or syrup) takes about 2-4 hours to work and lasts up to 22 hours.

Q. How long does ketotifen last?
Generally ketotifen eye drop takes 15 min to work and lasts up to 5-8 hours.


Content on this page was last updated on 02 January, 2016, by Dr. Varun Gupta (MD Pharmacology)