I go bird watching a lot in the woods and we have west nile here so I must use a bug repellant. The hives I got were unreal and made me so itchy. I then tried cintrinella and again same thing. The Dr. said it was ok for me to take bendryl which has helped a lot. I also changed to a lower precentage of the deet. I have only used it a couple of times so far. So I guess time will if this is better.