Ketotifen
conjunctivitis, allergic
"My eyes itched, stung, and teared constantly all-year-round to the point I saw an eye doctor. He diagnosed me with "dry eye" and recommend various dry eye drops prescription and not that did not work except very slightly. Apparently "dry eye" was not a correct or complete diagnosis. 

Months later a friend with allergy's recommended Claritin Eye. I took only one dose (one drop per eye) which stopped the symptoms almost immediately and the symptoms have not returned since (it has been four days so far). I am very happy now. "