2-(3-Phenoxyphenyl)propionic acid calcium salt dihydrate is the active pharmaceutical ingredient (API) known as fenoprofen calcium, a non-steroidal anti-inflammatory drug (NSAID). It is primarily used orally for the relief of mild to moderate pain and inflammation associated with conditions such as rheumatoid arthritis, osteoarthritis, and ankylosing spondylitis. Fenoprofen works by inhibiting cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis to alleviate pain, fever, and inflammation. The calcium salt form improves solubility and bioavailability, making it suitable for oral capsule formulations. Due to its efficacy and safety profile, it is prescribed for short-term management of acute pain or chronic inflammatory conditions, though gastrointestinal side effects should be monitored.