ZADITOR is the original triple-action, prescription-strength formula that works in minutes to deliver up to 12 hours of eye itch relief, by targeting itchy eyes right at the source. ZADITOR uses an antihistamine to temporarily relieve itchy eyes and doesn't contain a vasoconstrictor—the stuff that only works temporarily to "get the red out." Our triple-action formula works in three ways to stop itchy eyes at the source to provide immediate relief.