Dexamethasone belongs to the class of steroids known as corticosteroids. It is a corticosteroid that works on the immune system of the body to help relieve redness, swelling, itching, or any allergic reactions. Normally, our body has corticosteroids naturally which helps in maintaining health and our overall well-being. Synthetic steroids like Dexamethasone function by mimicking some of the body’s natural steroids to treat the disease.