60 day supply. Ketotifen Fumarate ophthalmic solution. Up to 12 hours. Eye itch relief in minutes! Original prescription strength. Adults and children 3 years and older. DirectionsAdults and children 3 years and older: put 1 drop in the affected eye(s) twice daily, every 8-12 hours, no more than twice per day. Children under 3 years of ag...