I believe I've been having exacerbations and have Symbicort that I haven't even opened yet. The side effects are very scary to me with this, Anoro ellipta and all similar drugs. When I read it may cause heart failure, liver, lowers immune system causing pneumonia, cancer and more, it does strike a little fear in me. The doc said the benefit outweighs the side effects. Has anyone experienced any of these dreadful side effects? Thank you in advance.