Out of desperation I decided to give this a try. I am so glad I did! I dont have to take Allegra or Claritin or Benadryl anymore, this works even better. I was always alternating allergy meds because I would start having side effects or it would quit working. I started the allercetin one evening, every two hours around 4:00. I went to bed at 10:00 worried I would wake up from being stuffy as usual, but to my surprise I could actually breathe! I slept all night breathing through my nose , it worked like magic. Its been two weeks now and all I do is take as needed, usually before bed every night and sometimes in the morning if the dust is bad where I live. I will always keep this in my cabinet, I also love that there are no side effects!