I have had brittle asthma for many years. It has recently changed so that I am much less wheezy between attacks. However, when I do have an attack it comes on within 5 minutes or so and deteriorates very fast. I used to get much more warning than this and it is becoming quite scary. I have now been told to use an EpiPen whilt waiting for ambulance and having a neb. I have an EpiPen for anaphylaxis but have not needed to use it for a long time. I didnt realize they were used for asthma so am suprised by this. Are there any side effects after you have injected it. I am a bit worried as not used one before and dont know what to expect. Any advice would be great.