Prednisone is a corticosteroid (cortisone-like medicine or steroid). It works on the immune system to help relieve swelling, redness, itching, and allergic reactions. This medicine is available only with your doctor's prescription. Prednisone is a prescription medicine used to treat acute asthma, arthritis, allergic reactions, respiratory illness, and many other conditions. Learn about dosage, side effects, warnings, and more. Prednisone is a steroid medication that treats a wide range of health conditions including asthma, allergic reactions, arthritis and inflammatory bowel disease. Prednisone is a prescription corticosteroid (steroid) used to reduce inflammation, suppress an overactive immune system, and treat endocrine and metabolic disorders. Prednisone is a drug used for suppressing the immune system and inflammation such as asthma, severe psoriasis, lupus, ulcerative colitis, Crohn's disease, and several types of arthritis. Side effects, drug interactions, dosage, and pregnancy and breastfeeding safety information are provided. Overview: Prednisone is used to treat a variety of inflammatory, autoimmune, and hormonal conditions. It works by suppressing the body’s immune response and reducing inflammation. Common side. Prednisone is a glucocorticoid medication mostly used to suppress the immune system and decrease inflammation in conditions such as asthma, COPD, and rheumatologic diseases. [3] Learn about the side effects of prednisone, from common to rare, for consumers and healthcare professionals. Learn about prednisone usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Prednisone is in a class of medications called corticosteroids. It works to treat patients with low levels of corticosteroids by replacing steroids that are normally produced naturally by the body.