Find patient medical information for Dexamethasone (Decadron) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Decdan 8mg Injection gives relief in autoimmune conditions like psoriasis, rheumatoid arthritis, eczema, atopic dermatitis, etc. It works by lowering your immune system’s response to these conditions thereby reducing symptoms such as swelling, pain, itching, and other allergic-type reactions. Dexamethasone Sodium Phosphate Injection gives relief in autoimmune conditions like psoriasis, rheumatoid arthritis, eczema, atopic dermatitis, etc. It works by lowering your immune system’s response to these conditions thereby reducing symptoms such as swelling, pain, itching, and other allergic-type reactions. Dekadron Injection belongs to a group of medicines called steroids. It is used in the treatment of various diseases and conditions such as inflammatory and autoimmune conditions. It provides relief from swelling, redness, and pain, by preventing the release of substances that cause inflammation.