I am allergic to all things green. Anyway, we had a heck of a time trying to come up with an allergy medicine that would work well and not interact badly with my other meds. 2 summers ago, my doctor got an idea to try and see if I took a year off from allergy meds how I would do, the theory went along the lines, if you can get through a season the next will be easier. It went okay. Oddly last summer I really did not have any issues at all. No clue why. This will mark my 3rd spring without allergy meds and if it continues to work, I will be thrilled. I must add, my head hurts a good 85% of the time, so my allergy symptoms could just be covered up by migraine pain.