Zaditor Antihistamine Eye Drops - 0.17 fl oz bottle 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. And unlike most over-the-counter eye drops, Zaditor uses only an antihistamine to temporarily relieve itchy eyes and doesn't contain a vasoconstrictor. Because our original prescription-strength formula doesn't use a vasoconstrictor, Zaditor Eye Drops is safe and effective for children aged 3 years and older*. *Consult your health care professional for use with children under 3 years of age.