... stabilizer. It is most commonly sold in as a salt of fumaric Acid, ketotifen fumarate, and is available in two forms ... its oral form, it is used to prevent asthma attacks. Side effects include drowsiness, weight gain, dry mouth, irritability, and increased ... Zyrtec Itchy-Eye Drops, and Claritin Eye. A generic version of Novartis' Zaditor, ketotifen fumarate ophthalmic solution, 0.025%, is available ...