It's not acute at all really. I rarely ever get it. But prime seems to trigger it automatically. I'm usually fine after a couple pumps of albuterol. I have been wondering why for the last couple of months I have been getting asthma after wc's. I thought maybe my asthma was just getting worst, and all the lifting and moving around was causing it. It finally hit me last night after doing a water change during the day, that it might be the prime. So I inhaled it for about 30 seconds, and sure enough I started getting an attack shortly after. I'll just have to hold my breath from now on when administering it.