Feldene is a NSAID (nonsteroidal anti-inflammatory drug). Piroxicam is its generic form but can also be in its brand form of Feldene. Feldene works by inhibiting hormones that cause pain and inflammation. Mostly, it is used to cure pain caused by arthritis. Other drugs found in this category include indomethacin, naproxen, ibuprofen, nabumetone among others.