Prednisone 20 mg is a moderate corticosteroid dose used for conditions like asthma. Learn how to take it safely and what side effects to expect. Prednisone is a prescription corticosteroid (steroid) used to reduce inflammation, suppress an overactive immune system, and treat endocrine and metabolic disorders. 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. Learn about prednisone usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Learn about the side effects of prednisone, from common to rare, for consumers and healthcare professionals. Prednisone is a steroid medication that treats a wide range of health conditions including asthma, allergic reactions, arthritis and inflammatory bowel disease. For this reason, glucocorticoid analogue drugs such as prednisone down-regulate the natural synthesis of glucocorticoids. This mechanism leads to dependence in a short time and can be dangerous if medications are withdrawn too quickly. 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. Prednisone reduces inflammation and allergy symptoms like those caused by rheumatoid arthritis and allergic asthma. Prednisone modifies the immune response of your body to various medical conditions to minimize inflammation, rashes, swelling and allergic reactions. Prednisone is a type of steroid medication that can treat diseases caused by inflammation or an overactive immune system. Your doctor may prescribe you prednisone for many different conditions.