Dexamethasone phosphate, specifically dexamethasone sodium phosphate, is a water-soluble phosphate ester prodrug of the potent glucocorticoid dexamethasone. It is a white to off-white crystalline powder. The phosphate ester modification significantly enhances its aqueous solubility compared to the parent dexamethasone, making it suitable for parenteral administration, including intravenous, intramuscular, and intra-articular injections. Its primary application is as an active pharmaceutical ingredient (API) in injectable formulations. It is a potent anti-inflammatory and immunosuppressive agent used to treat a wide range of conditions, including severe allergic reactions, shock, cerebral edema, exacerbations of chronic inflammatory diseases (e.g., rheumatoid arthritis), and certain dermatological conditions requiring systemic corticosteroid therapy. It works by binding to glucocorticoid receptors, modulating gene expression to inhibit the synthesis of pro-inflammatory mediators. As a prodrug, dexamethasone phosphate is rapidly hydrolyzed in vivo by phosphatases to release the active dexamethasone. It is a critical medication in hospital settings for emergency and intensive care. Handling requires precautions due to its potent biological activity and potential side effects associated with systemic corticosteroid use, such as immunosuppression and metabolic disturbances.