Prednisolone is used alone or with other medications to treat the symptoms of low corticosteroid levels (lack of certain substances that are usually produced by the body and are needed for normal body functioning). Prednisolone is also used to treat certain conditions that affect the blood, skin, eyes, central nervous system, kidneys, lungs, stomach, and intestines. It is also used to treat allergic reactions; and certain types of arthritis; multiple sclerosis (a disease in which the nerves do not function properly); and to help prevent transplant rejection (attack of the transplanted organ by the body) in certain adults who have received a transplant. Prednisolone is also sometimes used to treat symptoms from certain types of cancer. Prednisolone is in a class of medications called corticosteroids. It works by reducing swelling and redness and by changing the way the immune system works.