Is zaditor (ketotifen) better than opcon-a is?

Equivalent. Both of these are anti-allergic drops which due to a terrific safety profile, have been released for over the counter distribution. There is little to choose between each of these.

Related Questions

Can anyone tell me is zaditor (ketotifen) better than opcon-a?

Yes. Zaditor (ketotifen) is longer-acting and has less tendency to lose its efficacy with continued use than opcon-a. Read more...