Citra 100mg is a pain reliever and anti-inflammatory medication containing the active ingredient celecoxib. It is typically used to relieve pain, swelling, and joint stiffness caused by conditions such as osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. Celecoxib works by blocking the production of certain chemical messengers that cause pain and inflammation. It is a type of nonsteroidal anti-inflammatory drug (NSAID), and is available only by prescription.