I've recently had an asthma attack due to inhaling some van clutch fumes. I've had tests done in a hospital and after a few trips to a and e the doctors they said it should go with my relevant inhalers. Smybicort and now a tablet montelukast are what I'm taking. The doctor has given me prednisone 40mg daily I'm on the second day. How long does it take for it to take full effect I feel it's starting to work but not completely. My breathing is still not right could this be a recovery from the attack and how long would it take? I'm worries that the fumes have done permanent damage but the doctor said the lungs would clean and it's the after effect of it recovering. Any answers are appreciated? I just feel pushed out of a and e and left to give it time.