OTC
Antihistamine / Mast cell stabilizer (Antiallergy)
Ketotifen
Last reviewed April 2026
Who is this for?
What is this drug?
Ketotifen is an antiallergy medicine that works by blocking histamine — the chemical your body releases during allergic reactions — and also helps stabilize certain cells in your body to prevent them from releasing more allergy-causing substances.
What is it used for?
Eye allergies (itchyredwatery eyes)allergic conjunctivitis (apollo-like eye irritation from allergies)prevention of asthma attackshay feverskin allergies and itching
Available Over The Counter
Available at pharmacies without a prescription. Rules may vary by country.