What is "ketotifen"

n. An antihistamine drug used to treat allergic conjunctivitis.

Ketotifen is a second-generation noncompetitive H- antihistamine and mast cell stabilizer. It is most commonly sold as a salt with fumaric acid, ketotifen fumarate, and is available in two forms. In its ophthalmic form, it is used to treat allergic conjunctivitis, or the itchy red eyes caused by allergies. In its oral form, it is used to prevent asthma attacks.