Prednisone is an anti inflammatory. it reduces swelling opens up airways for those that have smoked too damn long it helps with sorethroats, sunburns, rashes and many other problems. Long term use can cause type 2 diabetes and if you are diabetic while on your glucose will be well over 200 while taking it. long term can also give you what is called prednisone skin. it is paper thin and tears easily.