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 prescription corticosteroid (steroid) used to reduce inflammation, suppress an overactive immune system, and treat endocrine and metabolic disorders. Prednisone 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). 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] 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. Prednisone is an oral corticosteroid. It's taken by mouth by adults and children to treat health conditions related to an overactive immune system or inflammation, such as allergies and certain skin conditions. Your healthcare team will determine your dose based on what medical condition you have. 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 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 5 mg is a low-dose steroid used for inflammation and immune conditions. Learn what it treats, its side effects, and how to take it safely. Prednisone is a steroid medication that treats conditions like asthma, allergic reactions, arthritis, inflammatory bowel disease and adrenal, blood or bone marrow conditions.