HZT-501, a fixed-dose combination of ibuprofen, a pain and inflammation relieving non-steroidal anti-inflammatory drug (NSAID), and famotidine, a histamine type 2 receptor antagonist (H2RA), is being developed for the treatment of patients with signs and symptoms of osteoarthritis, rheumatoid arthritis, mild to moderate pain or dysmenorrhea who are at risk of developing ibuprofen-associated upper gastrointestinal ulcers.