Betamethasone sodium phosphate and betamethasone acetate combination injection provides relief for inflamed areas of the body. It is used to treat a number of different conditions, such as inflammation (swelling), severe allergies, adrenal problems, arthritis, lung or breathing problems, blood or bone marrow problems, eye or vision problems, lupus, serious skin conditions, kidney problems, ulcerative colitis, and flare-ups of multiple sclerosis. Betamethasone sodium phosphate and betamethasone acetate combination is a corticosteroid (cortisone-like medicine or steroid).