Prednisolone is a treatment of a wide range of inflammatory and auto-immune conditions such as asthma. If you are an asthmatic and on this medication, it helps reduce inflamation in your bronchial tubes, so that you can breath better.
I'm sure there are many uses for prednisolone (an oral steroid.) I have had it prescribed for my bronchitis. It usually doesn't work for the wheeing and congestion, but it does help my MS for a few days, even at a very small dose. I believe it is usually used to clear up inflammation. I also had it once (or something very similar) believe, for optic neuritis. A doctor told me it was handed out like candy it was used so much. Hope this helps, Jane