Solu-Medrol Injection 40 mg Single-dose Act-O-Vial System Vials 25/Tray by Pfzier (RX)Solu Medrol Injection 40 mg is a brand name for an injectable form of methylprednisolone sodium succinate, which is a synthetic corticosteroid (steroid hormone) used primarily for its potent anti inflammatory and immunosuppressive effects. What is it used for? Solu Medrol is used to treat a variety of conditions that involve inflammation, severe allergies, or immune system disorders. Some of the common indications include: Severe allergic reactions