Zaditor is the leading OTC brand in USA. Patanol is the oldest formulation of prescription olopatadine and there are newer formulations pataday and Pazeo. They require prescription. Generic olopatadine is relatively new and i have no idea how well it works for most people
JCH MD
Zaditor is NOT the same as Patanol or Pataday. My doctor told me not to mix and match. NOW AARP Rx is sending me a generic Olopatadine HCL by Rising Labs and I am paying the same price as the Brand Patanol which works great for me. I live in NE NJ..
Try Zaditor eye drops over the counter in USA.
JCH MD