Corticosteroids, more often known as steroids, are an anti-inflammatory medicine prescribed for a wide range of conditions. Prednisone, brand names Prednisone Intensol and Rayos) belongs to a drug class called corticosteroids. Prednisone suppress the immune system and. Prednisone is a corticosteroid. It prevents the release of substances in the body that cause inflammation. It also suppresses the immune system.