This is NOT a suggestion nor a recommendation, but during 2 recent severe asthma attacks (when my salbutamol and Clenil Inhalers were of hardly any benefit) I remembered that - when I was a young kid (before modern asthma medications were around) my GP prescribed ephedrine. Now, because at the time of my recent attacks, I also had severe nasal congestion, I took a decongestant version of Sudafed. (Important: I believe some versions of Sudafed may NOT contain pseudo ephedrine, but might contain other drugs that you might need to avoid, so always ask the pharmacist and read the label). An hour or two later my breathing was very much improved. I then found a useful reference to pseudo ephedrine and asthma near the end of a very helpful article (a link to which I've included below). CAUTION. Pseudo Ephedrine is NOT suitable for people with certain conditions, and can be dangerous for folk with those conditions. It can also be dangerous for people on certain medications. Please therefore do your own research and check first with your own Doctor if you are tempted by this drug which is available in several over-the-counter medications in the UK. I'm NOT a Medical Professional, so do, pease be 'very' careful.