Has anyone out there who uses Symbicort ever come across a defective inhaler? I have been on this for a couple of years in varying doses. I started a new inhaler last week and wasn't convinced it was ""clicking"" right. I used it for a day or so and my asthma started to deteriorate. I changed to another new inhaler (I get them two at a time!) and started to improve again so I assume the first inhaler was faulty. I took it back to the chemist and they swapped it but I just wondered how common this is.