Key takeaways
Zaditor (ketotifen) and cromolyn (Crolom) are both eye drops used to treat allergy-related eye symptoms, but they have some key differences. Zaditor is an over-the-counter antihistamine and mast cell stabilizer that works quickly, often within 15 minutes, to relieve itchy eyes. It's suitable for adults and children aged 3 and older and is typically used twice a day. In contrast, cromolyn is a prescription-only mast cell stabilizer that helps with chronic eye allergies, including itching, tearing, and redness. Cromolyn takes longer to start working, often requiring several days to weeks for full effect. It can be used in adults and children as young as 4 years old, and typically used 4 to 6 times a day. While Zaditor shouldn’t be used for more than 3 days in a row, while cromolyn is safe for long-term use. Neither medication should be used with contact lenses due to preservatives that can damage the lenses. Cromolyn is considered a good option for pregnant women, but there isn’t enough information to know whether Zaditor is safe during pregnancy.
