Piroxicam betadex is a nonsteroidal anti-inflammatory drug. The mechanism of action of piroxicam is as a cyclooxygenase Inhibitor. It is well established in treating rheumatoid arthritis and osteoarthritis and used for musculoskeletal disorders, dysmenorrhea, and postoperative pain. It is used to reduce pain, swelling, and joint stiffness from arthritis. Reducing these symptoms helps you do more of your normal daily activities.